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Physics Study Guide
First Trimester Exam (December 3)
The first trimester exam will ask 80 multiple-choice questions (1 Point Each) and
8 math-based problems (2.5 Points Each) from chapters 1 thru 8. Questions will
be based on this study guide.
Multiple Choice
Identify the choice that best completes the statement or answers the question.
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1. Which one of the following steps is NOT a part of the scientific method?
a. Perform experiments to test the predictions.
b. Repeat the experiments until the answers match the predictions.
c. Formulate a general rule based on the predictions and experimental outcome.
d. Make a guess about the answer to a problem and predict its consequences.
e. Recognize a problem.
2. A scientific fact is
a. something you believe is true because you have been taught it.
b. a guess that has been tested over and over again and always found to be true.
c. close agreement by competent observers of observations of the same phenomena.
d. an educated guess that has yet to be proven by experiment.
e. a synthesis of a collection of data that includes well-tested guesses.
3. A hypothesis is
a. the long side of a right triangle.
b. an educated guess that has yet to be proven by experiment.
c. close agreement by competent observers of observations of the same phenomena.
d. a guess that has been tested over and over again and always found to be true.
e. a synthesis of a large collection of information that includes guesses.
4. A theory is
a. an educated guess that has yet to be proven by experiment.
b. a synthesis of a large collection of information including well-tested guesses.
c. close agreement by competent observers of observations of the same phenomena.
d. a guess that has been tested over and over again and always found to be true.
e. a science story about atoms and molecules.
5. Which of these is a scientific hypothesis?
a. Atoms are the smallest particles of matter that exist.
b. Albert Einstein is the greatest physicist of the twentieth century.
c. The universe is surrounded by a second universe, which cannot be seen.
6. Which of the following statements is not true?
a. Science is a method of answering theoretical questions.
b. Technology is a method of solving practical problems.
c. Technology may produce problems for society.
d. Science and technology make up a large part of everyday lives.
e. A good scientist is influenced by his or her likes and dislikes.
7. Science, art, and religion do not contradict one another because
a. if you choose religion and art you can forget about science.
b. all three have different domains.
c. if you choose the right one, you can forget the other two.
d. if you choose science you can forget about religion and art.
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8. Which one of the following problems would NOT be a part of physics?
a. Calculating the average density of a person
b. Calculating the amount of energy a person uses while listening to a lecture
c. Calculating the instantaneous velocity of an accelerating car
d. Identifying all the forces acting on a person who is walking uphill
e. Identifying all the bones in a human body
9. To test a scientific hypothesis you would
a. use the results of only the experiments that confirm the hypothesis.
b. set up an experiment and look at the results.
c. find the best result and report only that result.
d. set up many experiments and look at the results.
e. perform any physics experiment and look at the results.
10. The difference between a hypothesis and a theory is that a hypothesis is
a. never true whereas a theory is always true.
b. true whereas a theory is not true.
c. an isolated fact whereas a theory is a huge collections of facts.
d. never true whereas a theory is sometimes true.
e. an educated guess whereas a theory has been tested successfully many times in many
ways.
11. One difference between a hypothesis and a theory is that a hypothesis
a. is a guess that has not been well tested, whereas a theory is a synthesis of well-tested
guesses.
b. is testable, whereas a theory is not testable.
c. can be revised, whereas a theory cannot be revised.
d. is not testable, whereas a theory is testable.
12. Speed is
a. a measure of how fast something is moving.
b. always measured in terms of a unit of distance divided by a unit of time.
c. the distance covered per unit time.
d. all of the above.
e. none of the above.
13. When you look at the speedometer in a moving car, you can see the car's
a. average distance traveled.
b. instantaneous acceleration.
c. average speed.
d. instantaneous speed.
e. average acceleration.
14. Acceleration is defined as the CHANGE in
a. time it takes to move from one place to another place.
b. velocity of an object.
c. distance divided by the time interval.
d. velocity divided by the time interval.
e. time it takes to move from one speed to another speed.
____ 15. A train travels 6 meters in the first second of travel, 6 meters again during the second second of
travel, and 6 meters again during the third second. Its acceleration is
a. 0 m/s2.
b. 6 m/s2.
c. 12 m/s2.
d. 18 m/s2.
e. none of the above
____ 16. A car starts from rest and after 7 seconds it is moving at 42 m/s. What is the car’s average
acceleration?
a. 0.17 m/s2
b. 1.67 m/s2
c. 6 m/s2
d. 7 m/s2
e. none of the above
____ 17. As an object falls freely in a vacuum, its
a. velocity increases.
b. acceleration increases.
c. both A and B.
d. none of the above.
____ 18. In the absence of air resistance, objects fall at constant
a. speed.
b. velocity.
c. acceleration.
d. distances each successive second.
e. all of the above
____ 19. A ball is thrown upwards and caught when it comes back down. In the absence of air resistance,
the speed of the ball when caught would be
a. less than the speed it had when thrown upwards.
b. more than the speed it had when thrown upwards.
c. the same as the speed it had when thrown upwards.
____ 20. Suppose an object is in free fall. Each second the object falls
a. the same distance as in the second before.
b. a larger distance than in the second before.
c. with the same instantaneous speed.
d. with the same average speed.
e. none of the above
____ 21. If you drop a feather and a coin at the same time in a tube filled with air, which will reach the
bottom of the tube first?
a. The feather
b. Neither—they will both reach the bottom at the same time.
c. The coin
____ 22. The hang time (time one's feet are off the ground in a jump) for most athletes is
a. less than 1 second.
b. considerably more than 1 second.
c. about 1 second.
d. slightly more than 1 second.
____ 23. When a basketball player jumps to make a shot, once the feet are off the floor, the jumper's
acceleration
a. varies with body orientation.
b. depends on launch speed.
c. is usually greater for taller players (but not always).
d. depends on all the above.
e. is g; no more, no less.
____ 24. Suppose you take a trip that covers 180 km and takes 3 hours to make. Your average speed is
a. 30 km/h.
b. 60 km/h.
c. 180 km/h.
d. 360 km/h.
e. 540 km/h.
____ 25. Suppose a car is moving in a straight line and steadily increases its speed. It moves from 35 km/h
to 40 km/h the first second and from 40 km/h to 45 km/h the next second. What is the car's
acceleration?
a. 5 km/h·s
b. 10 km/h·s
c. 35 km/h·s
d. 40 km/h·s
e. 45 km/h·s
____ 26. A ball is thrown straight up. At the top of its path its instantaneous speed is
a. 0 m/s.
b. about 5 m/s.
c. about 10 m/s.
d. about 20 m/s.
e. about 50 m/s.
____ 27. A ball is thrown straight up. At the top of its path its acceleration is
a. 0 m/s2.
b. about 5 m/s2.
c. about 10 m/s2.
d. about 20 m/s2.
e. about 50 m/s2.
____ 28. When something falls to the ground, it accelerates. This acceleration is called the acceleration due
to gravity and is symbolized by the letter g. What is the value of g on Earth's surface?
a. 0 m/s2
b. about 5 m/s2
c. about 10 m/s2
d. about 20 m/s2
e. about 50 m/s2
____ 29. A car accelerates at 2 m/s2. Assuming the car starts from rest, how much time does it need to
accelerate to a speed of 20 m/s?
a. 2 seconds
b. 10 seconds
c. 20 seconds
d. 40 seconds
e. none of the above
____ 30. If a ball were equipped with a speedometer and allowed to fall freely on a planet where the
acceleration due to gravity is 23 m/s2, the reading on the speedometer would increase each second
by
a. a rate that depends on its initial speed.
b. 10 m/s.
c. 12 m/s.
d. 23 m/s.
e. 46 m/s.
____ 31. A freely falling object starts from rest. After falling for 6 seconds, it will have a speed of about
a. 6 m/s.
b. 30 m/s.
c. 60 m/s.
d. 300 m/s.
e. more than 300 m/s.
____ 32. A freely falling object starts from rest. After falling for 1 second, it will have a speed of about
a. 5 m/s.
b. 10 m/s.
c. 20 m/s.
d. 40 m/s.
e. none of the above
____ 33. If you drop a feather and a coin at the same time in a vacuum tube, which will reach the bottom of
the tube first?
a. Neither-they will both reach the bottom at the same time.
b. The coin
c. The feather
____ 34. If a projectile is fired straight up at a speed of 30 m/s, the total time to return to its starting point
is about
a. 3 second.
b. 6 seconds.
c. 30 seconds.
d. 60 seconds.
e. not enough information to estimate.
____ 35. The vertical height attained by a basketball player who achieves a hang time of a full one second
is about
a. 0.8 m.
b. 1 m.
c. 1.2 m.
d. 2.5 m.
e. more than 2.5 m.
____ 36. A vector is a quantity that has
a. magnitude and time.
b. time and direction.
c. magnitude and direction.
____ 37. A scalar is a quantity that has
a. direction.
b. magnitude.
c. time.
d. color.
____ 38. Which of the following would NOT be considered a projectile?
a. A cannonball thrown straight up
b. A cannonball rolling down a slope
c. A cannonball rolling off the edge of a table
d. A cannonball thrown through the air
e. All of the above are projectiles.
____ 39. In the absence of air friction, the vertical component of a projectile's velocity doesn't change as
the projectile moves.
a. Always false
b. Always true
c. Sometimes true
____ 40. At the instant a ball is thrown horizontally with a large force, an identical ball is dropped from the
same height. Which ball hits the ground first?
a. Neither. They both hit the ground at the same time.
b. The dropped ball
c. The horizontally thrown ball
____ 41. A ball is thrown into the air at some angle. At the very top of the ball's path, its velocity is
a. entirely vertical.
b. There's not enough information given to determine.
c. both vertical and horizontal.
d. entirely horizontal.
____ 42. In the absence of air resistance, the angle at which a thrown ball will go the farthest is
a. 15 degrees.
b. 30 degrees.
c. 45 degrees.
d. 60 degrees.
e. 75 degrees.
____ 43. At what part of a path does a projectile have minimum speed?
a. When it returns to the ground
b. Halfway to the top
c. At the top of its path
d. When it is thrown
e. There's not enough information to say.
____ 44. A projectile launched horizontally hits the ground in 0.8 seconds. If it had been launched with a
much higher speed in the same direction, it would have hit the ground (neglecting Earth's
curvature and air resistance) in
a. more than 0.8 s.
b. 0.8 s.
c. less than 0.8 s.
____ 45. A projectile is fired horizontally in a vacuum. The projectile maintains its horizontal component
of speed because it
a. has no vertical component of speed to begin with.
b. is not acted on by any forces.
c. the net force acting on it is zero.
d. is not acted on by any horizontal forces.
e. none of the above
____ 46. A baseball is hurled into the air at an angle of 30 degrees above the horizontal and lands on a
target that is at the same level as that where the baseball started. The baseball will also land on the
target if it is thrown at an angle of
a. 20 degrees.
b. 40 degrees.
c. 50 degrees.
d. 60 degrees.
e. none of the above
____ 47. A cannonball is launched horizontally from a tower. If the cannon has a barrel velocity of 60 m/s,
where will the cannonball be 1 second later? (Neglect air resistance.)
a. 6 m downrange
b. 30 m downrange
c. 60 m downrange
d. 300 m downrange
e. none of the above
____ 48. After a rock that is thrown straight up reaches the top of its path and is starting to fall back down,
its acceleration is (neglecting air resistance)
a. less than when it was at the top of its path.
b. greater than when it was at the top of its path.
c. the same as when it was at the top of its path.
____ 49. An airplane flying into a head wind loses ground speed, and an airplane flying with the wind
gains ground speed. If an airplane flies at right angles to the wind, then ground speed is
a. more.
b. unchanged.
c. less.
____ 50. When in orbit, a satellite such as the space shuttle is
a. simply a projectile.
b. in non-accelerated motion.
c. free from Earth's gravity.
____ 51. Suppose a small plane can fly at 170 km/h relative to the surrounding air. Suppose also that there
is a 60 km/h tailwind. How fast does the plane's shadow move across the ground?
a. 5 km/h
b. 60 km/h
c. 110 km/h
d. 170 km/h
e. 230 km/h
____ 52. At the instant a ball is thrown horizontally with a large force, an identical ball is dropped from the
same height. Which ball hits the ground first?
a. Neither—they both hit the ground at the same time.
b. The horizontally thrown ball
c. The dropped ball
____ 53. A cannonball is fired at some angle into the air. In the first second it moves 5 meters horizontally.
Assuming it doesn't hit the ground and air resistance is negligible, how far does it move
horizontally in the next second?
a.
b.
c.
d.
More than 5 m
Less than 5 m
5m
Not enough information.
____ 54. In the absence of air resistance, at what other angle will a thrown ball go the same distance as one
thrown at an angle of 75 degrees?
a. 15 degrees.
b. 65 degrees.
c. 70 degrees.
d. 80 degrees.
e. 90 degrees.
____ 55. A ball is thrown straight upward at 10 m/s. Ideally (no air resistance), the ball will return to the
thrower's hand with a speed of
a. 0 m/s.
b. 5 m/s.
c. 10 m/s.
d. 20 m/s.
e. There is not enough information to say.
____ 56. A cannon with a barrel velocity of 140 m/s launches a cannonball horizontally from a tower.
Neglecting air resistance, how far vertically will the cannonball have fallen after 4 seconds?
a. 80 m
b. 140 m
c. 560 m
d. 2240 m
e. none of the above
____ 57. The astronomer Copernicus publicly stated in the 1500s that Earth
a. does not move.
b. revolves around the sun.
c. is slowing down.
d. moves in a straight line.
e. is the center of the solar system.
____ 58. The law of inertia applies to
a. objects at rest.
b. moving objects.
c. both moving and nonmoving objects.
____ 59. After a cannonball is fired into frictionless space, the amount of force needed to keep it going
equals
a. zero, since no force is necessary to keep it moving.
b. twice the force with which it was fired.
c. one half the force with which it was fired.
d. the same amount of force with which it was fired.
e. one quarter the force with which it was fired.
____ 60. If the force of gravity suddenly stopped acting on the planets, they would
a. spiral slowly towards the sun.
b. continue to orbit the sun.
c. move in straight lines tangent to their orbits.
d. spiral slowly away from the sun.
e. fly straight away from the sun.
____ 61. A sheet of paper can be withdrawn from under a container of milk without toppling it if the paper
is jerked quickly. The reason this can be done is that
a. gravity pulls very hard on the milk carton.
b. the milk carton has very little weight.
c. the milk carton has inertia.
d. none of the above
____ 62. One object has twice as much mass as another object. The first object also has twice as much
a. velocity.
b. gravitational acceleration.
c. inertia.
d. all of the above
____ 63. Compared to its weight on Earth, a 10-kg object on the moon will weigh
a. the same amount.
b. less.
c. more.
____ 64. Compared to its mass on Earth, the mass of a 10-kg object on the moon is
a. the same.
b. more.
c. less.
____ 65. The mass of a sheep that weighs 110 N is about
a. 1 kg.
b. 11 kg.
c. 110 kg.
d. 1100 kg.
e. none of the above
____ 66. The force required to maintain an object at a constant speed in free space is equal to
a. the mass of the object.
b. the weight of the object.
c. zero.
d. the force required to stop it.
e. none of the above
____ 67. An object following a straight-line path at constant speed
a. has no forces acting on it.
b. has a net force acting on it in the direction of motion.
c. has zero acceleration.
d. must be moving in a vacuum.
e. none of the above
____ 68. A 15-N force and a 45-N force act on an object in opposite directions. What is the net force on
the object?
a. 15 N
b. 30 N
c. 45 N
d. 60 N
e. none of the above
____ 69. You would have the largest mass of gold if your chunk of gold weighed 1 N on
a. Earth.
b. Jupiter.
c. the moon.
____ 70. Equilibrium occurs when
a.
b.
c.
d.
e.
all the forces acting on an object are balanced.
the sum of the +x forces on an object equals the sum of the –x forces.
the net force on the object is zero.
the sum of the upward forces equals the sum of the downward forces.
all of the above
____ 71. What would be the safest way to put up a clothesline?
a. It doesn't make any difference which way the line is strung.
b. With the line very tight
c. With some slack in the line
____ 72. A barge is being pulled along a canal by two ropes that make equal angles with the direction in
which the barge points. Assuming the two pulls on the barge are equal, in what direction does the
barge move?
a. It oscillates back and forth between the two banks.
b. It moves straight ahead.
c. It moves in the direction of the resultant force on it.
d. both A and B
e. both B and C
____ 73. The weight of a person can be represented by a vector that acts
a. in a direction that depends on where the person is standing.
b. perpendicular to the ground underneath the person.
c. parallel to the ground.
d. straight down, even if the person is standing on a hill.
e. all of the above
____ 74. A 100-N lantern is suspended by a pair of ropes with 120 degrees between them (each 60 degrees
from the vertical). The tension in each rope is
a. less than 100 N.
b. more than 100 N.
c. 100 N.
____ 75. Which has more mass, a kilogram of feathers or a kilogram of iron?
a. The feathers
b. The iron
c. Neither—they both have the same mass.
____ 76. How much does a 3.0-kg bag of bolts weigh?
a. 7.2 N
b. 14.4 N
c. 22.8 N
d. 29.4 N
e. 58.8 N
____ 77. A 5-N force and a 30-N force act in the same direction on an object. What is the net force on the
object?
a. 5 N
b. 25 N
c. 30 N
d. 35 N
e. none of the above
____ 78. An object weighs 30 N on Earth. A second object weighs 30 N on the moon. Which has the
greater mass?
____ 79.
____ 80.
____ 81.
____ 82.
____ 83.
____ 84.
____ 85.
____ 86.
____ 87.
a. The one on Earth
b. The one on the moon
c. They have the same mass.
d. Not enough information to say
What is the minimum resultant possible when adding a 5-N force to an 8-N force?
a. 5 N
b. 3 N
c. 8 N
d. 13 N
e. 40 N
How does acceleration of an object change in relation to its mass? It is
a. directly proportional.
b. Acceleration doesn't depend on mass at all.
c. inversely proportional.
The acceleration produced by a net force on an object is
a. inversely proportional to the mass of the object.
b. directly proportional to the magnitude of the net force.
c. in the same direction as the net force.
d. all of the above
e. none of the above
When an object reaches terminal velocity its acceleration is
a. 0 m/s2.
b. 4.9 m/s2.
c. 9.8 m/s2.
A heavy person and a light person parachute together and wear the same size parachutes.
Assuming they open their parachutes at the same time, which person reaches the ground first?
a. the light person
b. the heavy person
c. Neither -- they both reach the ground together.
A 10-kg brick and a 1-kg book are dropped in a vacuum. The force of gravity on the 10-kg brick
is
a. 10 times as much as the force on the 1-kg book.
b. zero.
c. the same as the force on the 1-kg book.
When a woman stands with two feet on a scale, the scale reads 280 N. When she lifts one foot,
the scale reads
a. less than 280 N.
b. more than 280 N.
c. 280 N.
Suppose the force of friction on a sliding object is 25 N. The force needed to maintain a constant
velocity is
a. more than 25 N.
b. 25 N
c. less than 25 N.
A book weighs 4 N. When held at rest in your hands, the net force on the book is
a. 0 N.
b. 0.4 N.
c. 4 N.
d. 39 N.
e. none of the above
____ 88. An apple weighs 1 N. The net force on the apple when it is in free fall is
a. 0 N.
b. 0.1 N.
c. 1 N.
d. 9.8 N.
e. none of the above
____ 89. A push on a 1-kilogram brick accelerates the brick. Neglecting friction, to equally accelerate a
10-kilogram brick, one would have to push
a. with 100 times as much force.
b. with 10 times as much force.
c. with just as much force.
d. with 1 the amount of force.
10
e. none of the above
____ 90. A rock is thrown vertically into the air. At the very top of its trajectory the net force on it is
a. its weight.
b. less than its weight.
c. more than its weight.
____ 91. A box is dragged without acceleration in a straight-line path across a level surface by a force of
13 N. What is the frictional force between the box and the surface?
a. 13 N
b. Less than 13 N
c. More than 13 N
d. Need more information to say.
____ 92. Suppose a particle is accelerated through space by a constant 10-N force. Suddenly the particle
encounters a second force of 10-N in a direction opposite to that of the first force. The particle
a. is brought to a rapid halt.
b. theoretically accelerates to speeds approaching the speed of light.
c. continues at the speed it had when it encountered the second force.
d. gradually decelerates to a halt.
e. none of the above
____ 93. The unit of pressure is
a. newtons per meter.
b. newtons per square meter (or pascals).
c. the newton.
d. the meter.
e. meters per second squared.
____ 94. Which of the following would exert the most pressure on the ground?
a. A woman standing in running shoes
b. A woman standing on skis
c. A woman standing in high-heel shoes
____ 95. A tennis ball and a solid steel ball with the same diameter are dropped at the same time. Which
ball has the greater force acting on it?
a. The steel ball
b. The tennis ball
c. They both have the same force acting on them.
____ 96. A tennis ball and a solid steel ball with the same diameter are dropped at the same time. In the
absence of air resistance, which ball has the greater acceleration?
a. The steel ball
b. The tennis ball
c. They both have the same acceleration.
____ 97. The reason a tennis ball and a solid steel ball will accelerate at the same rate, in the absence of air
resistance, is that
a. they have the same mass.
b. the ball with the larger force has the smaller mass.
c. the ball with the larger force also has the larger mass.
d. the force acting on them is the same.
e. none of the above
____ 98. The terminal speed for a person parachuting (with the chute open) is about
a. 0 km/h.
b. 15 km/h.
c. 150 km/h.
d. 1500 km/h.
____ 99. Aunt Minnie throws a rock downward, and air resistance is negligible. Compared to a rock that is
dropped, the acceleration of the rock after it is thrown is
a. less.
b. the same.
c. more.
____ 100. If you pull horizontally on a desk with a force of 150 N and the desk doesn't move, the friction
force must be 150 N. Now if you pull with 250 N so the desk slides at constant velocity, the
friction force is
a. more than 150 N but less than 250 N.
b. 250 N.
c. more than 250.
____ 101. When the angle of an incline with a block resting on it increases, the normal support force
a. increases.
b. stays the same.
c. decreases.
____ 102. Consider a ball rolling down the decreasing slope inside a semicircular bowl (the slope is steep at
the top rim, gets less steep toward the bottom, and is zero (no slope) at the bottom). As the ball
rolls from the rim downward toward the bottom, its rate of gaining speed
a. increases.
b. remains the same.
c. decreases.
____ 103. A speeding truck locks it brakes and it skids to a stop. If the truck's total mass were doubled, its
skidding distance would be
a. half as far.
b. nearly as far, but not quite.
c. the same.
d. twice as far.
e. four times as far.
____ 104. If the force acting on a cart doubles, what happens to the cart's acceleration?
a. It quarters.
b. It halves.
c. It stays the same.
d. It doubles.
e. It quadruples.
____ 105. Suppose a cart is being moved by a force. If suddenly a load is dumped into the cart so that the
cart's mass doubles, what happens to the cart's acceleration?
a. It quarters.
b. It halves.
c. It stays the same.
d. It doubles.
e. It quadruples.
____ 106. You are on a frozen pond, and the ice starts to crack. If you lie down on the ice and begin to
crawl, this will
a. increase the pressure on the ice.
b. decrease the pressure on the ice.
c. increase the total force on the ice.
d. decrease the total force on the ice.
____ 107. A 20-N falling object encounters 4 N of air resistance. The magnitude of the net force on the
object is
a. 0 N.
b. 4 N.
c. 16 N.
d. 20 N.
e. none of the above
____ 108. A sportscar has a mass of 1500 kg and accelerates at 5 meters per second squared. What is the
magnitude of the force acting on the sportscar?
a. 300 N.
b. 1500 N.
c. 2250 N.
d. 7500 N.
e. none of the above
____ 109. A tow truck exerts a force of 2000 N on a car, accelerating it at 1 m/s/s. What is the mass of the
car?
a. 667 kg
b. 1000 kg
c. 2000 kg
d. 8000 kg
e. none of the above
____ 110. A jet has a mass of 40,000 kg. The thrust for each of four engines is 20,000 N. What is the jet's
acceleration when taking off?
a. 0.3 m/s2
b. 0.5 m/s2
____ 111.
____ 112.
____ 113.
____ 114.
____ 115.
____ 116.
____ 117.
____ 118.
c. 1 m/s2
d. 2 m/s2
e. none of the above
You pull horizontally on a 50-kg crate with a force of 450 N and the friction force on the crate is
250 N. The acceleration of the crate is
a. 2 m/s2.
b. 4 m/s2.
c. 9 m/s2.
d. 14 m/s2.
A high school student hits a nail with a hammer. During the collision, there is a force
a. on the nail but not on the hammer.
b. on the nail and also on the hammer.
c. on the hammer but not on the nail.
A player hits a ball with a bat. The action force is the impact of the bat against the ball. What is
the reaction to this force?
a. The force of the ball against the bat
b. The weight of the ball
c. Air resistance on the ball
d. The grip of the player's hand against the bat
e. none of the above
As a ball falls, the action force is the pull of Earth's mass on the ball. What is the reaction to this
force?
a. The pull of the ball's mass on Earth
b. The acceleration of the ball
c. Nonexistent in this case
d. Air resistance acting against the ball
e. none of the above
A person is attracted towards the center of Earth by a 440-N gravitational force. The force with
which Earth is attracted toward the person is
a. 440 N.
b. very very small.
c. very very large.
An unfortunate bug splatters against the windshield of a moving car. Compared to the force of the
car on the bug, the force of the bug on the car is
a. larger.
b. the same.
c. smaller.
d. Need more information to say
An unfortunate bug splatters against the windshield of a moving car. Compared to the
deceleration of the car, the deceleration of the bug is
a. larger.
b. the same.
c. smaller.
If a horse pulls on a wagon at rest, the wagon pulls back equally on the horse. Can the wagon be
set into motion?
a. Yes, because there is a net force acting on the wagon.
b. Yes, because there is a time delay between action and reaction.
c. No, because the forces cancel each other.
d. Yes, because the horse's pull on the wagon is larger than the wagon's pull on the horse.
____ 119. A large truck and a small car traveling at the same speed have a head-on collision. The vehicle to
undergo the greater change in velocity will be
a. the small car.
b. the large truck.
c. neither—both are the same
____ 120. According to Newton's third law, if you push gently on something, it will push
a. gently on something else.
b. on you only if you aren't moving.
c. gently on you.
d. on something only under the right conditions.
____ 121. Nellie Newton holds an apple in her hand. If action is Earth pulling on the apple, then reaction is
a. her hand providing a normal force on the apple.
b. her hand pushing up on the apple.
c. both A and B
d. neither A nor B
____ 122. Bronco the skydiver falls toward Earth. The attraction of Earth on Bronco pulls him down. The
reaction to this force is
a. Bronco finally pushing against Earth's surface.
b. Bronco pulling up on Earth.
c. Earth's surface finally pushing against Bronco.
d. neither A, B, nor C
____ 123. A rocket is able to accelerate in the vacuum of space when it fires its engines. The force that
propels the rocket is the force
a. of the rocket on the exhaust gases.
b. of the exhaust gases on the rocket.
c. neither A nor B
____ 124. Your friend says that the heavyweight champion of the world cannot exert a force of 95 N on a
piece of tissue paper with his best punch. The tissue paper is held in midair, no wall and no tricks.
a. You agree that it can't be done.
b. You disagree, for a good punch easily delivers this much force.
c. You have reservations about this claim.
____ 125. As a 600-N woman sits on the floor, the floor exerts a force on her of
a. 6 N.
b. 60 N.
c. 1200 N.
d. 600 N.
e. 6000 N.
____ 126. Suppose two people, one having three times the mass of the other, pull on opposite sides of a 20meter rope while on frictionless ice. After a brief time, they meet. The more massive person
slides a distance of
a. 4 m.
b. 5 m.
c. 6 m.
d. 7 m.
____ 127. The momentum of an object is defined as the object's
a. mass times its velocity.
b. force times the time interval.
c. force times its acceleration.
d. mass times it acceleration.
e. velocity times the time interval.
____ 128. Which has more momentum, a large truck moving at 30 miles per hour or a small truck moving at
30 miles per hour?
a. Both have the same momentum.
b. The small truck
c. The large truck
____ 129. Compared to a sports car moving at 30 miles per hour, the same sports car moving at miles per
hour has
a. twice as much momentum.
b. four times as much momentum.
c. the same momentum.
____ 130. If the momentum of an object changes and its mass remains constant,
a. it is accelerating (or decelerating).
b. there is a force acting on it.
c. its velocity is changing.
d. all of the above
e. none of the above
____ 131. The momentum change of an object is equal to the
a. impulse acting on it.
b. velocity change of the object.
c. force acting on it.
d. force acting on it times its velocity.
e. object's mass times the force acting on it.
____ 132. In order to increase the final momentum of a golf ball, we could
a. increase the force acting on it.
b. follow through when hitting the ball.
c. increase the time of contact with the ball.
d. swing as hard as possible.
e. all of the above
____ 133. The reason padded dashboards are used in cars is that they
a. look nice and feel good.
b. decrease the impulse in a collision.
c. increase the force of impact in a collision.
d. decrease the momentum of a collision.
e. increase the time of impact in a collision.
____ 134. A table tennis ball launcher is fired. Compared to the force on the ball, the force on the launcher
is
a. larger.
b. the same.
c. smaller.
____ 135. A table tennis ball launcher is fired. Compared to the impulse on the ball, the impulse on the
launcher is
a. smaller.
b. larger.
c. the same.
____ 136. A collision is considered elastic if
a. there is no lasting deformation.
b. the objects don’t stick together.
c. the objects that collide don't get warmer.
d. after the collision, the objects have the same shape as before the collision.
e. all of the above
____ 137. Suppose a girl is standing on a pond where there is no friction between her feet and the ice. In
order to get off the ice, she can
a. bend over touching the ice in front of her and then bring her feet to her hands.
b. walk very slowly on tiptoe.
c. get on her hands and knees and crawl off the ice.
d. throw something in the direction opposite to the way she wants to go.
e. all of the above will work
____ 138. A freight train rolls along a track with considerable momentum. If it were to roll at the same
speed but had twice as much mass, its momentum would be
a. zero.
b. unchanged.
c. quadrupled.
d. doubled.
____ 139. A cannon recoils from launching a cannonball. The speed of the cannon's recoil is small because
the
a. impulse on the cannon is less than the impulse on the cannonball.
b. cannon has far more mass than the cannonball.
c. momentum of the cannon is unchanged.
d. force against the cannon is relatively small.
e. none of the above
____ 140. Suppose a cannon is made of a strong but very light material. Suppose also that the cannonball is
more massive than the cannon itself. For such a system
a. conservation of momentum would not hold.
b. conservation of energy would not hold.
c. the target would be a safer place than where the operator is located.
d. the force on the cannonball would be greater than the force on the cannon.
e. recoil problems would be lessened.
____ 141. Two objects, A and B, have the same size and shape, but A is twice as heavy as B. When they are
dropped simultaneously from a tower, they reach the ground at the same time, but A has a higher
a. acceleration.
b. momentum.
c. speed.
d. all of the above
e. none of the above
____ 142. In order to catch a ball, a baseball player moves his or her hand backward in the direction of the
ball's motion. Doing this reduces the force of impact on the player's hand principally because
a. the time of impact is decreased.
b. the time of impact is increased.
c. the velocity of the hand is reduced.
d. the momentum of impact is reduced.
e. none of the above
____ 143. A car traveling along the highway needs a certain amount of force exerted on it to stop. More
stopping force may be required when the car has
a. less stopping distance.
b. more momentum.
c. more mass.
d. all of the above
e. none of the above
____ 144. A cannon fires a cannonball. The speed of the cannonball will be the same as the speed of the
recoiling cannon
a. if the mass of the cannonball equals the mass of the cannon.
b. because momentum is conserved.
c. because velocity is conserved.
d. because both velocity and momentum are conserved.
e. none of the above
____ 145. The force of an apple hitting the ground depends upon
a. the speed of the apple just before it hits.
b. the time of impact with the ground.
c. whether or not the apple bounces.
d. air resistance on the apple as it falls.
e. all of the above
____ 146. When you jump off a step, you usually bend your knees as you reach the ground. By doing this,
the time of the impact is about 10 times more what it would be in a stiff-legged landing, and the
average force on your body is reduced by
a. less than 10 times.
b. about 10 times.
c. more than 10 times.
____ 147. A 1-N apple falls to the ground. The apple hits the ground with an impact force of
a. 1 N.
b. 2 N.
c. 4 N.
d. 9.8 N.
e. Not enough information to say
____ 148. A moving freight car runs into an identical car at rest on the track. The cars couple together.
Compared to the velocity of the first car before the collision, the velocity of the combined cars
after the collision is
a. zero.
b. one half as large.
c. the same.
d. twice as large.
e. More information is needed to say.
____ 149. Two gliders having the same mass and speed move toward each other on an air track and stick
together. After the collision, the velocity of the gliders is
a. twice the original velocity.
b. one half the original velocity.
c. zero.
____ 150.
____ 151.
____ 152.
____ 153.
____ 154.
____ 155.
____ 156.
____ 157.
d. the same as the original velocity.
e. There is not enough information to say.
A piece of putty moving with 2 units of momentum strikes and sticks to a heavy bowling ball that
is initially at rest. After the putty sticks to the ball, both are set in motion with a combined
momentum that is
a. less than 2 units.
b. 2 units.
c. more than 2 units.
d. There is not enough information to say.
The force that accelerates a rocket into outer space is exerted on the rocket by
a. the exhaust gases.
b. Earth's gravity.
c. atmospheric pressure.
d. rocket's wings.
e. none of the above
If all people, animals, trains and trucks all over the world began to walk or run towards the east,
then
a. Earth would spin a bit slower.
b. Earth's spin would not be affected at all.
c. Earth would spin a bit faster.
Suppose an astronaut in outer space wishes to toss a ball against a very massive and perfectly
elastic concrete wall and catch it as it bounces back. If the ball is as massive as the astronaut, then
a. the astronaut's time between catches will decrease as the game progresses.
b. the astronaut will never catch the first bounce.
c. the astronaut will catch one bounce only.
d. none of the above
A table tennis ball moving forward with 5 units of momentum strikes and bounces backward off a
heavy bowling ball that is initially at rest and free to move. The bowling ball is set in motion with
a momentum of
a. less than 5 units.
b. 5 units.
c. more than 5 units.
d. not enough information.
Superman is at rest in space when he throws an asteroid that has more mass than he does. Which
moves faster, Superman or the asteroid?
a. Superman
b. The asteroid
c. They both move at the same speed.
A cannonball shot from a long-barrel cannon travels faster than one shot from a short-barrel
cannon because the cannonball receives a greater
a. force.
b. impulse.
c. both A and B
d. neither A nor B
While roller-skating, Granny collides with her tiny grandson Ambrose who is at rest. Ignoring
any friction effects, Ambrose's speed after the collision will be greatest when
a. Granny catches him and they both move together.
b. he and Granny make a bouncing collision, each going in opposite directions.
____ 158. A small economy car (low mass) and a limousine (high mass) are pushed from rest across a
parking lot, equal distances with equal forces. The car that receives the greater impulse is the
a. limousine.
b. small economy car.
c. neither A nor B (same for each).
____ 159. A 2-kg ball is thrown at 3 m/s. What is the ball's momentum?
a. 2 kg·m/s
b. 3 kg·m/s
c. 6 kg·m/s
d. 9 kg·m/s
e. none of the above
____ 160. A ball is moving at 6.0 m/s and has a momentum of 24.0 kg·m/s. What is the ball's mass?
a. 0.3 kg
b. 4.0 kg
c. 24.0 kg
d. 144.0 kg
e. none of the above
____ 161. In physics, work is defined as
a. force times time.
b. force divided by distance.
c. distance divided by time.
d. force divided by time.
e. force times distance.
____ 162. If you lift one load up two stories, how much work do you do compared to lifting one load up
only one story?
a. One quarter as much
b. One half as much
c. The same amount
d. Twice as much
e. Four times as much
____ 163. If Nellie Newton pushes an object with twice the force for twice the distance, she does
a. twice the work.
b. the same work.
c. four times the work.
d. eight times the work.
____ 164. The unit of work is the
a. watt.
b. meter.
c. joule.
d. newton.
e. second.
____ 165. Power is defined as the
a. force on an object divided by the time the force acts.
b. work done times the time taken to do that work.
c. work done on an object divided by the time taken to do the work.
d. distance divided by the time taken to move that distance.
e. force on an object times the distance the object moves.
____ 166. The unit of power is the
a. newton.
b. meter.
c. joule.
d. second.
e. watt.
____ 167. Potential energy is the energy an object has because of its
a. density.
b. size.
c. location.
d. speed.
e. temperature.
____ 168. The amount of potential energy possessed by an elevated object is equal to
a. the power used to lift it.
b. the distance it is lifted.
c. the force needed to lift it.
d. the work done in lifting it.
e. the value of the acceleration due to gravity.
____ 169. An arrow in a bow has 70 J of potential energy. Assuming no loss of energy to heat, how much
kinetic energy will it have after it has been shot?
a. 0 J
b. 35 J
c. 50 J
d. 70 J
e. 140 J
____ 170. When a car’s speed triples, its kinetic energy
a. remains the same.
b. triples.
c. increases by four times.
d. increases by nine times.
e. none of the above
____ 171. Rockets are launched from an airplane in the forward direction of motion. The kinetic energy of
the airplane will be
a. unchanged.
b. increased.
c. decreased.
____ 172. A woman can lift barrels a vertical distance of 1 meter or can roll them up a 2-meter long ramp to
the same elevation. If she uses the ramp, the applied force required is
a. 1 as much.
4
b. 1 as much.
2
c. the same amount.
d. 2 times as much.
e. 4 times as much.
____ 173. A job is done slowly, and an identical job is done quickly. Both jobs require the same amount of
work but different amounts of
a. energy.
b. power.
c. both A and B
d. none of the above
____ 174. Which requires more work: lifting a 70-kg sack vertically 2 meters or lifting a 35-kg sack
vertically 4 meters?
a. Lifting the 70 kg sack
b. Lifting the 35 kg sack
c. Both require the same amount of work.
____ 175. A ball is thrown into the air with 100 J of kinetic energy, which is transformed to gravitational
potential energy at the top of its trajectory. When it returns to its original level after encountering
air resistance, its kinetic energy is
a. 100 J.
b. more than 100 J.
c. less than 100 J.
d. Not enough information given.
____ 176. An object that has kinetic energy must be
a. at rest.
b. falling.
c. moving.
d. elevated.
____ 177. An object that has kinetic energy must have
a. acceleration.
b. a force applied to maintain it.
c. momentum.
d. none of the above
____ 178. Which has greater kinetic energy, a car traveling at 30 km/h or a half-as-massive car traveling at
60 km/h?
a. The 60 km/h car
b. Both have the same kinetic energy.
c. The 30 km/h car
____ 179. A person on a roof throws one ball downward and an identical ball upward at the same speed.
The ball thrown downward hits the ground with 140 J of kinetic energy. Ignoring air friction, with
how much kinetic energy does the second ball hit the ground?
a. less than 140 J
b. 140 J
c. 280 J
d. more than 280 J
e. none of the above
____ 180. An object at rest may have
a. energy.
b. speed.
c. velocity.
d. momentum.
e. none of the above
____ 181. A heavy object and a light object are released from rest at the same height and time in a vacuum.
As they fall, they have equal
a. energies.
b. weights.
c. momenta.
d. all of the above
e. none of the above
____ 182. If an object has kinetic energy, then it also must have
a. impulse.
b. force.
c. momentum.
d. acceleration.
e. none of the above
____ 183. All simple machines ideally work on the principle that
a. impulse equals momentum change.
b. force equals mass times acceleration.
c. total momentum before a collision equals total momentum after the collision.
d. work input equals work output.
e. kinetic energy transforms into potential energy.
____ 184. The ratio of output force to input force of a simple machine is called the
a. fulcrum.
b. efficiency.
c. pivot point.
d. lever arm.
e. mechanical advantage.
____ 185. A pulley system can
a. change the direction of a force.
b. multiply the force.
c. increase the amount of work done.
d. Both A and B
e. Both B and C
____ 186. The ratio of useful work output to total work input is called the
a. mechanical advantage.
b. lever arm.
c. pivot point.
d. fulcrum.
e. efficiency.
____ 187. About how efficient is a typical gasoline-burning car engine?
a. 5%
b. 30%
c. 70%
d. 100%
____ 188. A small economy car (low mass) and a limousine (high mass) are pushed from rest across a
parking lot, equal distances with equal forces. The car that receives more kinetic energy is the
a. the limousine.
b. the small economy car.
c. neither one—they receive the same amount of kinetic energy.
____ 189. How many joules of work are done on a box when a force of 25 N pushes it 3 m?
a. 1 J
b. 3 J
c. 8 J
d. 25 J
e. 75 J
____ 190. How much power is required to do 40 J of work on an object in 5 seconds?
a. 0 W
b. 5 W
c. 8 W
d. 40 W
e. 200 W
____ 191. How much work is done on a 60-N box of books that you carry horizontally across a 6-m room?
a. 0 J
b. 6 J
c. 10 J
d. 60 J
e. 360 J
____ 192. How much work is done on a 20-N crate that you lift 2 m?
a. 0 J
b. 1 J
c. 2 J
d. 20 J
e. 40 J
____ 193. How much power is expended if you lift a 60 N crate 10 meters in 1 second?
a. 0 W
b. 6 W
c. 10 W
d. 60 W
e. 600 W
____ 194. Suppose a moving car has 3000 J of kinetic energy. If the car's speed doubles, how much kinetic
energy will it then have?
a. 1000 J
b. 1500 J
c. 3000 J
d. 6000 J
e. 12,000 J
____ 195. It takes 80 J to push a large box 8 m across a floor. Assuming the push is in the same direction as
the move, what is the magnitude of the force on the box?
a. 8 N
b. 10 N
c. 80 N
d. 640 N
e. none of the above
____ 196. A 60-N object moves at 1 m/s. Its kinetic energy is
a. 1 J.
b. 3 J.
c. 60 J.
d. more than 60 J.
____ 197. Sue can easily lift a 45.0-N rock with the help of a lever. When she pushes down with 20.0 N of
force, she lifts the rock 0.3 meters. How far does she move her arms to do this?
a. 0.3 m
b. 0.7 m
c. 6.0 m
d. 2.3 m
e. 20.0 m
____ 198. A pulley has two supporting strands. In order for it to lift a load 1 meter, the person pulling will
have to pull a distance of
a.
m.
b.
m.
c. 1 m.
d. 2 m.
e. 4 m.
____ 199. A certain jack has a theoretical mechanical advantage of 300. However, due to frictional forces,
the actual mechanical advantage is only 100. What is the efficiency of the jack?
a. 1
3
b.
c.
d.
e.
3
30
300
30,000
____ 200. A machine puts out 100 watts of power for every 1000 watts put into it. The efficiency of the
machine is
a. 10%.
b. 50%.
c. 90%.
d. 110%.
e. none of the above
Problem
201. A bicycle travels 15 km in 30 minutes. What is its average speed?
202. What is the average acceleration of a car that goes from rest to 60 km/h in 8 seconds?
203. A jet on an aircraft carrier can be launched from 0 to 40 m/s in 2 seconds. What is the
acceleration of the jet?
204. You toss a ball at 5 m/s straight upward. How much time will the ball take to reach the top of its
path?
205. What is the hang time of a person who can jump a vertical distance of 0.6 m?
206. How much time does a car with an acceleration of 5 m/s2 take to go from 5 m/s to 40 m/s?
207. A crate falls from an airplane flying horizontally at an altitude of 1250 m. Neglecting air drag,
how long will the crate take to strike the ground?
208. If a projectile fired beneath the water, straight up, breaks through the surface at a speed of 13 m/s,
to what height above the water will it ascend?
209. A stone is dropped from a cliff. After it has fallen 10 m, what is the stone's velocity?
210. A package falls out of a helicopter that is traveling horizontally at 70 m/s. It falls into the water
below 8.0 seconds later. Assuming no air resistance, what is the horizontal distance it travels
while falling?
211. Kyle throws a ball horizontally from the top of a building that is 5.0 m high. He hopes the ball
will reach a swimming pool that is at the bottom of the building, 12.0 m horizontally from the
edge the building. If the ball is to reach the pool, with what initial speed must Kyle throw it with?
212. An airplane whose airspeed is 295 km/h flies parallel to the direction of a wind with a speed of
40.0 km/h. What are the two possible speeds of the plane relative to the ground?
213. Consider an escalator at an angle of 45° above the horizontal that moves with a velocity of 2.0
m/s. What is the horizontal component of the escalator's velocity?
214. A ball is thrown horizontally from the top of a tall cliff. Neglecting air drag, what vertical
distance has the ball fallen 2.0 seconds later?
215. A snowball rolls off the edge of a horizontal roof at a velocity of 3.0 m/s. What is the speed of the
snowball 1.0 s later?
216. A projectile shot with an initial velocity of 51 m/s at an angle of 45° follows a parabolic path and
hits a stationary balloon at the top of its trajectory. With what speed does the projectile hit the
balloon?
217. A ball is thrown upward. Its initial vertical component of velocity is 30 m/s and its initial
horizontal component of velocity is 10 m/s. What is the ball's speed 4 s later?
218. In a standing jump, the hang time of a certain athlete is 0.8 second. What is her hang time when
she jumps the same height while moving horizontally?
219. How much (in newtons) does a 10.0-kg bag of grass seed weigh?
220. A person weighs 650 N. What is the mass of the person?
221. On the moon, the acceleration due to gravity is
kg of bologna on the moon?
that on Earth. What would be the weight of 0.9
222. Two forces of 10 N both act on an object. The angle between the forces is 90. What is the
magnitude of their resultant?
223. A 230.0 kg bear grasping a vertical tree slides down at constant velocity. What is the friction
force between the tree and the bear?
224. You push with 10.0 N on a 5.0-kg block and there are no opposing forces. How fast will the block
accelerate?
225. You push with 27 N on a 10-kg chest, and there is a 7-N force of friction. How fast will the chest
accelerate?
226. An unbalanced force of 30 N gives an object an acceleration of 6.0 m/s2. What force would be
needed to give it an acceleration of 1.0 m/s2?
227. A net force of 1.0 N acts on a 4.0-kg object, initially at rest, for 4.0 seconds. What is the distance
the object moves during that time?
228. When air resistance on a falling skydiver builds up to 0.3 the weight of the skydiver, what is the
acceleration of the skydiver?
229. Bronco the skydiver, whose mass is 80 kg experiences 200 N of air resistance. What is the
acceleration of his fall?
230. If you push off the ground with a force of 350 N when you jump upward, what force pushes Earth
downward?
231. A pair of blocks, one 2 times as massive as the other, are connected by a compressed spring.
When the spring is released, the blocks fly apart. Compared to the heavier block, how many times
as fast does the lighter block accelerate?
232. A 60-kg person on in-line skates pushes against a wall with a force of 30 N and recoils. What
acceleration does that person experience?
233. A fighter punches a sheet of paper in midair, and brings it from rest up to a speed of 40 m/s in
0.08 s. What is the force of impact on the paper if the mass of the paper is 0.01 kg?
234. What engine thrust (in newtons) is required for a rocket of mass 35 kg to leave the launching pad?
235. A cement truck of mass 16,000 kg moving at 15 m/s slams into a cement wall and comes to a
halt. What is the force of impact on the truck?
236. A 10-kg cement block moving horizontally at 6 m/s plows into a bank of sand and comes to a
stop in 2 s. What is the average impact force on the bank?
237. A 5-kg blob of clay moving horizontally at 4 m/s has a head-on collision with a 4-kg blob of clay
that moves toward it at 2 m/s. What is the speed of the two blobs stuck together immediately after
the collision?
238. A 10-kg bowling ball moving at 4 m/s bounces off a spring at about the same speed that it had
before bouncing. What is the change in momentum of the bowling ball?
239. A loaded freight car has 5 times as much mass as an empty freight car. If the loaded car coasts at
5 m/s and collides with and attaches to the empty car at rest, what will be the speed of both cars
after collision?
240. A 50-kg cart moving at 100 km/h collides head-on with an approaching 50-kg cart moving at 10
km/h (in the opposite direction). If the two carts stick together, what will be their speed?
241. A 30-kg girl and a 50-kg boy face each other on friction-free roller skates. The girl pushes the
boy, who moves away at a speed of 3 m/s. What is the girl's speed?
242. A 70-kg free-floating astronaut fires 0.10-kg of gas at a speed of 30 m/s from her propulsion
pistol. What is the astronaut's recoil speed?
243. What is the work done in lifting 60 kg of blocks to a height of 20 m?
244. What amount of work is done on a chair that is pushed 9 m across a floor by a horizontal 30-N
net force?
245. A car traveling at 50 km/h will skid 20 m when its brakes are locked. If the same car is traveling
at 150 km/h, what will be its skidding distance?
246. What amount of work can a 600-W motor do in 4 minutes?
247. A couch potato might consume 7 million J of energy in a day. What is this rate of energy
consumption in watts?
248. At what height does a 1000-kg mass have a potential energy of 1 J relative to the ground?
249. The 4.0-kg head of an ax is moving at 4.0 m/s when it strikes a log and penetrates 0.01 m into the
log. What is the average force the blade exerts on the log?
250. An anvil hanging vertically from a long rope in a barn is pulled to the side and raised like a
pendulum 1.60 m above its equilibrium position. It then swings to its lowermost point where the
rope is cut by a sharp blade. The anvil then has a horizontal velocity with which it sails across the
barn and hits the floor, 10.0 m below. How far horizontally along the floor will the anvil land?