Download Physics 1st Semester Exam Answer Section

Physics 1st Semester Exam
Multiple Choice
Identify the choice that best completes the statement or answers the question.
____
1. Physics is the most basic science because
a. the foundation of biology is chemistry and the foundation of chemistry is physics.
b. it is about the nature of basic things like forces, energy, and motion.
c. the ideas of physics extend into more complex sciences.
d. you can better understand science in general if you understand physics.
e. all of the above
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2. 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.
____
3. 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.
____
4. 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.
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5. Which of the following is (are) possible unit of speed
a. miles per hour.
b. light years per century.
c. kilometers per hour.
d. all of the above.
e. none of the above.
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6. 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
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7. 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.
____
8. 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
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9. Consider drops of water leaking from a water faucet. As the drops fall they
a. remain at a relatively fixed distance from each other.
b. get farther apart.
c. get closer together.
____ 10. A ball tossed vertically upward rises, reaches its highest point, and then falls back to its starting point. During
this time the acceleration of the ball is always
a. in the direction of motion.
b. opposite its velocity.
c. directed downward.
d. directed upward.
____ 11. 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
____ 12. 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
____ 13. 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.
____ 14. 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
____ 15. 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.
____ 16. A girl whose weight is 500 N hangs from the middle of a bar supported by two vertical strands of rope. What
is the tension in each strand?
a. 0 N.
b. 250 N.
c. 500 N.
d. 750 N.
e. 1000 N.
____ 17. 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.
____ 18. What is needed to describe a vector quantity?
a. only magnitude
b. only direction
c. both magnitude and direction
d. neither magnitude nor direction
____ 19. A scalar quantity has
a. only direction.
b. only magnitude.
c. both magnitude and direction.
d. neither magnitude nor direction.
____ 20. Galileo found that a ball rolling down one inclined plane would roll how far up another inclined plane?
a. The ball would not roll up the other plane at all.
b. To nearly its original height
c. To about one quarter its original height
d. To nearly twice its original height
e. To nearly half its original height
____ 21. 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
____ 22. 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
____ 23. Friction
a. comes from microscopic bumps that act as obstructions to the object's motion.
b. is the name given to the force acting between surfaces sliding past one another.
c. acts in a direction that opposes the motion of an object.
d. all of the above
e. none of the above
____ 24. Compared to its weight on Earth, a 10-kg object on the moon will weigh
a. the same amount.
b. less.
c. more.
____ 25. 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
____ 26. An object weighs 30 N on Earth. A second object weighs 30 N on the moon. Which has the greater mass?
a. The one on Earth
b. The one on the moon
c. They have the same mass.
d. Not enough information to say
____ 27. Accelerations are produced by
a. forces.
b. velocities.
c. accelerations.
d. masses.
e. none of the above
____ 28. 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
____ 29. 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.
____ 30. A girl pulls on a 10-kg wagon with a constant force of 20 N. What is the wagon's acceleration?
a. 0.5 m/s2
b. 2 m/s2
c. 10 m/s2
d. 20 m/s2
e. 200 m/s2
____ 31. 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.
____ 32. Pressure is defined as
a. time per area.
b. velocity per time.
c. force per time.
d. force per area.
e. distance per time.
____ 33. 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
____ 34. 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
____ 35. 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.
____ 36. 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.
____ 37. A block is at rest on an incline. The force of friction necessary to prevent the block from sliding increases
when the incline angle is
a. increased.
b. decreased.
c. neither A nor B (Force of friction stays the same.)
____ 38. 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
____ 39. 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
c. 1 m/s2
d. 2 m/s2
e. none of the above
____ 40. How much force is needed to accelerate a 4.0-kg physics book to an acceleration of 2.0 m/s2?
a. 0 N
b. 2.0 N
c. 0.5 N
d. 8.0 N
e. 24.0 N
____ 41. A 6-N falling object encounters 6 N of air resistance. The magnitude of the net force on the object is
a. 0 N.
b. 6 N.
c. 12 N.
d. none of the above
____ 42. A scalar is a quantity that has
a. direction.
b. magnitude.
c. time.
d. color.
____ 43. 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.
____ 44. 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
____ 45. 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.
____ 46. A cannonball is launched from the ground at an angle of 30 degrees above the horizontal and a speed of 30
m/s. Ideally (no air resistance) the ball will land on the ground with a speed of
a. 0 m/s.
b. 20 m/s.
c. 30 m/s.
d. 40 m/s.
e. There is not enough information to say.
____ 47. An object is dropped and falls freely to the ground with an acceleration of g. If it is thrown upward at an angle
instead, its acceleration would be
a. 0.
b. larger than g.
c. g upward.
d. g downward.
e. none of the above
____ 48. 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
____ 49. 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
____ 50. 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.
These 50 questions and your unit 2 test will be the foundation for the exam.
The answer key to these questions is posted on our website.
The answer to unit 2 Test will be posted after everyone has taken the test.
(most likely Friday)
Physics 1st Semester Exam
Answer Section
MULTIPLE CHOICE
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E
PTS: 1
DIF: L2
OBJ: 1.1 The Basic Science-Physics
P1.2k
KEY: physics | science
BLM: comprehension
B
PTS: 1
DIF: L2
OBJ: 1.3 Scientific Methods
P1.2i
KEY: scientific method | experiment
BLM: comprehension
C
PTS: 1
DIF: L1
OBJ: 1.4 The Scientific Attitude
P1.1A| P1.1B| P1.2f
KEY: fact | scientific method
knowledge
E
PTS: 1
DIF: L1
OBJ: 1.4 The Scientific Attitude
P1.1A| P1.1B| P1.2f
KEY: hypothesis | theory
comprehension
D
PTS: 1
DIF: L2
OBJ: 4.2 Speed
P2.1A| P2.1g| P2.3a
KEY: speed | unit BLM: comprehension
C
PTS: 1
DIF: L2
OBJ: 4.4 Acceleration
P2.1g| P2.2B| P2.2D
KEY: acceleration BLM: application
C
PTS: 1
DIF: L2
OBJ: 4.5 Free Fall: How Fast?
P2.2B
KEY: air | resistance | speed
BLM: comprehension
B
PTS: 1
DIF: L2
OBJ: 4.5 Free Fall: How Fast?
P2.2B
KEY: free fall
BLM: comprehension
B
PTS: 1
DIF: L2
OBJ: 4.5 Free Fall: How Fast?
P2.2B
KEY: acceleration | distance
BLM: application
C
PTS: 1
DIF: L2
OBJ: 4.5 Free Fall: How Fast?
P2.2B
KEY: acceleration | direction
BLM: application
A
PTS: 1
DIF: L2
OBJ: 4.4 Acceleration
P2.1g| P2.2B| P2.2D
KEY: acceleration | speed
application
B
PTS: 1
DIF: L2
OBJ: 4.4 Acceleration
P2.1g| P2.2B| P2.2D
KEY: acceleration BLM: application
D
PTS: 1
DIF: L2
OBJ: 4.6 Free Fall: How Far?
P2.1g
KEY: gravity | speed
BLM: application
A
PTS: 1
DIF: L2
4.8 Air Resistance and Falling Objects
STA: P1.1E| P1.1f
vacuum | fall BLM: comprehension
C
PTS: 1
DIF: L2
OBJ: 4.7 Graphs of Motion
P2.1C| P2.1D| P2.2e
KEY: hang time
BLM: application
B
PTS: 1
DIF: L2
OBJ: 2.2 Mechanical Equilibrium
P3.1A| P3.2C
KEY: weight | tension
application
C
PTS: 1
DIF: L2
OBJ: 2.3 Support Force
P1.1A| P1.1D| P1.1f
KEY: tension | rope
application
C
PTS: 1
DIF: L1
OBJ: 2.5 Vectors
P1.1B| P2.2g
KEY: vector | magnitude
knowledge
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PTS: 1
DIF:
P1.1B| P2.2g
KEY:
knowledge
B
PTS: 1
DIF:
P3.2A| P3.4A
KEY:
knowledge
C
PTS: 1
DIF:
P1.1C| P3.3b| P3.4A
KEY:
application
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PTS: 1
DIF:
P1.1C| P3.3b| P3.4A
KEY:
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PTS: 1
DIF:
P1.1C| P3.3b| P3.4A
KEY:
comprehension
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PTS: 1
DIF:
P3.1d| P3.4A| P3.6C
KEY:
comprehension
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PTS: 1
DIF:
P3.1d| P3.4A| P3.6C
KEY:
application
B
PTS: 1
DIF:
P3.1d| P3.4A| P3.6C
KEY:
application
A
PTS: 1
DIF:
acceleration | force
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D
PTS: 1
DIF:
acceleration | force
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C
PTS: 1
DIF:
P1.2j| P3.4C KEY: weight
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B
PTS: 1
DIF:
6.3 Newton's Second Law of Motion
acceleration | force
BLM:
A
PTS: 1
DIF:
P2.2A| P3.2C| P3.4C
KEY:
application
D
PTS: 1
DIF:
P1.2j| P3.4C KEY: pressure | force
C
PTS: 1
DIF:
P1.2j| P3.4C KEY: pressure
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C
PTS: 1
DIF:
P2.3a
KEY: acceleration | mass
B
PTS: 1
DIF:
P1.2i| P2.1E KEY: terminal speed
B
PTS: 1
DIF:
P2.2A| P3.2C| P3.4C
KEY:
application
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PTS: 1
DIF:
P2.2A| P3.2C| P3.4C
KEY:
application
L1
OBJ: 2.5 Vectors
scalar | magnitude
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OBJ: 3.3 Galileo on Motion
Galileo | inclined plane
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OBJ: 3.4 Newton's Law of Inertia
inertia | weight
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OBJ: 3.4 Newton's Law of Inertia
force | speed BLM: comprehension
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OBJ: 3.4 Newton's Law of Inertia
friction | motion
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OBJ: 3.5 Mass-A Measure of Inertia
weight | Earth
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OBJ: 3.5 Mass-A Measure of Inertia
weight | newtons
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OBJ: 3.5 Mass-A Measure of Inertia
weight | mass
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knowledge
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comprehension
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comprehension
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application
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force | friction
6.1 Force Causes Acceleration
6.1 Force Causes Acceleration
6.5 Applying Force--Pressure
P2.3a| P3.1A
6.4 Friction
L1
OBJ: 6.5 Applying Force--Pressure
BLM: knowledge
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OBJ: 6.5 Applying Force--Pressure
comprehension
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OBJ: 6.6 Free Fall Explained
BLM: application
L1
OBJ: 6.7 Falling and Air Resistance
BLM: knowledge
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OBJ: 6.4 Friction
force | friction | velocity
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OBJ: 6.4 Friction
friction | incline
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DIF:
P1.2i| P2.1E KEY: force | resistance
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6.3 Newton's Second Law of Motion
mass | acceleration
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D
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DIF:
6.3 Newton's Second Law of Motion
force | acceleration
BLM:
A
PTS: 1
DIF:
6.3 Newton's Second Law of Motion
force | resistance
BLM:
B
PTS: 1
DIF:
P1.1B
KEY: scalar | magnitude
B
PTS: 1
DIF:
P2.1h| P2.2g KEY: projectile
BLM:
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PTS: 1
DIF:
5.5 Projectiles Launched Horizontally
projectile | gravity
BLM:
C
PTS: 1
DIF:
P2.1h| P2.2g KEY: projectile | speed
C
PTS: 1
DIF:
P2.1h| P2.2g KEY: projectile | resistance
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PTS: 1
DIF:
P2.1h| P2.2g KEY: acceleration | gravity
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PTS: 1
DIF:
P2.2g
KEY: vector
BLM:
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PTS: 1
DIF:
5.5 Projectiles Launched Horizontally
projectile | gravity
BLM:
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5.6 Projectiles Launched at an Angle
speed | gravity
BLM:
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OBJ: 6.7 Falling and Air Resistance
BLM: application
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STA: P2.3a| P3.1A
application
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STA: P2.3a| P3.1A
application
L2
STA: P2.3a| P3.1A
application
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5.1 Vector and Scalar Quantities
knowledge
5.4 Projectile Motion
P2.1h| P2.2g
5.4 Projectile Motion
comprehension
5.4 Projectile Motion
application
5.4 Projectile Motion
analysis
5.2 Velocity Vectors
P2.1h| P2.2g
P2.1h| P3.2A