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PHY 2011 1ST MT REVIEW #2
Multiple Choice Identify the choice that best completes the statement or answers the question.
(CAPITAL LETTERS ONLY PLEASE)
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1. 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
____
2. Friction is a force that always acts
a. perpendicular to an object's motion.
b. opposite to an object's motion.
c. in the same direction as an object's motion.
____
3. The law of inertia states that an object
a. will continue moving at the same velocity unless an outside force acts on it.
b. will continue moving in a straight line unless an outside force acts on it.
c. that is not moving will never move unless a force acts on it.
d. at rest will remain at rest unless acted on by an outside force.
e. will do all of the above.
____
4. 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.
____
5. 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.
____
6. A sheet of paper can be withdrawn from under a container of milk without toppling it if the paper is jerked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
____
7. 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
____
8. Compared to its mass on Earth, the mass of a 10-kg object on the moon is
a. the same.
b. more.
c. less.
____
9. You would have the largest mass of gold if your chunk of gold weighed 1 N on
a. Earth.
b. Jupiter.
c. the moon.
____ 10. 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.
____ 11. 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
____ 12. Which of the following is NOT true about Aristotle’s concept of violent motion?
a. Violent motion is imposed motion
b. Violent motion has an external cause
c. Violent motion is the result of forces that push or pull
d. Violent motion is thought to be either straight up or straight down
____ 13. 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.
____ 14. 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.
____ 15. 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
____ 16. An object has a constant mass. A constant force on the object produces constant
a. velocity.
b. acceleration.
c. both A and B
d. none of the above
____ 17. Pressure is defined as
a. time per area.
b.
c.
d.
e.
velocity per time.
force per time.
force per area.
distance per time.
____ 18. 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
____ 19. 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.
____ 20. 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
____ 21. 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.
____ 22. 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.
____ 23. 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.
____ 24. 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.
____ 25. 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.
b.
c.
d.
e.
667 kg
1000 kg
2000 kg
8000 kg
none of the above
____ 26. 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.
____ 27. 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
____ 28. A jumbo jet cruises at a constant velocity when the total thrust of the engines on the jet is 50,000 N. How much
air resistance acts on the jet?
a. 0 N
b. 25,000 N
c. 50,000 N
d. 75,000 N
e. 100,000 N
____ 29. If shopping cart A has five times more mass in it than shopping cart B and the two carts are pushed with equal
forces, you can expect the acceleration of shopping cart A to be
a.
times that of shopping cart B.
b.
times that of shopping cart B.
c. 5 times that of shopping cart B.
d. 25 times that of shopping cart B.
____ 30. If a truck has ten times the mass of a car and the two vehicles are pushed with an equal force, you would expect
the acceleration of the truck to be
a.
times that of the car.
b.
times that of the car.
c. 10 times that of the car.
d. 100 times that of the car.
True/False
Indicate whether the statement is true or false.
____ 31. A force can be simply defined as a push or a pull.
____ 32. Inertia is the property that every material object has; inertia resists changes in an object's state of motion.
____ 33. If you were to slide a hockey puck across a frictionless ice rink, there must be a horizontal force on it to keep it
in motion.
____ 34. The force due to gravity acting on an object is its mass.
____ 35. An astronaut has the same mass on Earth as in space.
____ 36. In the fourth century B.C., Aristotle divided motion into two types: natural motion and violent motion.
____ 37. The acceleration of an object is inversely proportional to the net force acting on it.
____ 38. It is possible for an object in free fall to have zero acceleration.
____ 39. Pressure is defined as the force one object exerts on another object.
____ 40. The speed of an object dropped in air will continue to increase without limit.
Problem
41. How much (in newtons) does a 10.0-kg bag of grass seed weigh?
42. How much (in newtons) does 0.60 kg of salami weigh?
43. On the moon, the acceleration due to gravity is
on the moon?
that on Earth. What would be the weight of 0.9 kg of bologna
44. On the surface of Jupiter, the acceleration due to gravity is about 3 times that of Earth. What would be the mass
of a 170-kg rock on Jupiter?
45. You push with 10.0 N on a 5.0-kg block and there are no opposing forces. How fast will the block accelerate?
46. 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?
47. 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?
48. A certain unbalanced force gives a 20-kg object an acceleration of 2.0 m/s2. What acceleration would the same
force give a 30-kg object?
49. When air resistance on a falling skydiver builds up to 0.3 the weight of the skydiver, what is the acceleration of
the skydiver?
50. A 20-kg block of cement is pulled upward (not sideways!) with a force of 400 N. What is the acceleration of the
block?
PHY 2011 1ST MT REVIEW #2
Answer Section
MULTIPLE CHOICE
1. ANS:
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2. ANS:
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3. ANS:
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4. ANS:
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5. ANS:
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19. ANS:
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20. ANS:
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21. ANS:
KEY:
B
PTS: 1
DIF:
Galileo | inclined plane
BLM:
B
PTS: 1
DIF:
friction | force
BLM:
E
PTS: 1
DIF:
inertia | force
BLM:
A
PTS: 1
DIF:
force | friction
BLM:
C
PTS: 1
DIF:
gravity | planets
BLM:
C
PTS: 1
DIF:
inertia | weight
BLM:
C
PTS: 1
DIF:
speed | acceleration
BLM:
A
PTS: 1
DIF:
mass | Earth BLM: comprehension
C
PTS: 1
DIF:
mass | weight
BLM:
C
PTS: 1
DIF:
mass | kilogram
BLM:
B
PTS: 1
DIF:
weight | mass
BLM:
D
PTS: 1
DIF:
Aristotle | motion
BLM:
B
PTS: 1
DIF:
acceleration | terminal velocity
BLM:
B
PTS: 1
DIF:
friction | force
BLM:
A
PTS: 1
DIF:
force | weight
BLM:
B
PTS: 1
DIF:
mass | acceleration
BLM:
D
PTS: 1
DIF:
pressure | force
BLM:
C
PTS: 1
DIF:
pressure
BLM: comprehension
C
PTS: 1
DIF:
acceleration | gravity
BLM:
C
PTS: 1
DIF:
acceleration | mass
BLM:
C
PTS: 1
DIF:
angle | support force
BLM:
L1
OBJ:
knowledge
L1
OBJ:
knowledge
L1
OBJ:
knowledge
L2
OBJ:
application
L2
OBJ:
application
L2
OBJ:
application
L2
OBJ:
comprehension
L2
OBJ:
L2
OBJ:
analysis
L2
OBJ:
comprehension
L2
OBJ:
application
L2
OBJ:
knowledge
L2
OBJ:
comprehension
L2
OBJ:
comprehension
L2
OBJ:
comprehension
L2
OBJ:
comprehension
L1
OBJ:
knowledge
L2
OBJ:
3.3 Galileo on Motion
3.3 Galileo on Motion
3.4 Newton's Law of Inertia
3.4 Newton's Law of Inertia
3.4 Newton's Law of Inertia
3.4 Newton's Law of Inertia
3.4 Newton's Law of Inertia
3.5 Mass—A Measure of Inertia
3.5 Mass—A Measure of Inertia
3.5 Mass—A Measure of Inertia
3.5 Mass—A Measure of Inertia
3.1 Aristotle on Motion
6.7 Falling and Air Resistance
6.4 Friction
6.1 Force Causes Acceleration
6.3 Newton's Second Law
6.5 Applying Force—Pressure
6.5 Applying Force—Pressure
L2
OBJ: 6.7 Falling and Air Resistance
comprehension
L2
OBJ: 6.6 Free Fall Explained
application
L2
OBJ: 6.3 Newton's Second Law
application
22. ANS:
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23. ANS:
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24. ANS:
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25. ANS:
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26. ANS:
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27. ANS:
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28. ANS:
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29. ANS:
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30. ANS:
KEY:
C
PTS: 1
speed | slope BLM: application
C
PTS: 1
mass | acceleration
B
PTS: 1
force | mass BLM: application
C
PTS: 1
force | acceleration
B
PTS: 1
acceleration | friction
D
PTS: 1
force | acceleration
C
PTS: 1
velocity | resistance
B
PTS: 1
mass | acceleration | inversely
B
PTS: 1
mass | acceleration | inversely
DIF: L2
OBJ: 6.3 Newton's Second Law
DIF: L2
BLM: application
DIF: L2
OBJ: 6.3 Newton's Second Law
DIF:
BLM:
DIF:
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DIF:
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DIF:
BLM:
DIF:
BLM:
DIF:
BLM:
L2
application
L2
application
L2
application
L2
application
L2
application
L2
application
OBJ: 6.3 Newton's Second Law
T
PTS: 1
DIF:
force | push | pull
BLM:
T
PTS: 1
DIF:
inertia | change
F
PTS: 1
DIF:
friction | force | motion
BLM:
F
PTS: 1
DIF:
gravity | mass
BLM:
T
PTS: 1
DIF:
mass | Earth BLM: comprehension
T
PTS: 1
DIF:
Aristotle | motion
BLM:
F
PTS: 1
DIF:
acceleration | force
BLM:
F
PTS: 1
DIF:
free fall | acceleration
BLM:
F
PTS: 1
DIF:
pressure | force
BLM:
F
PTS: 1
DIF:
speed
BLM: comprehension
L1
application
L1
BLM:
L2
application
L1
knowledge
L2
OBJ: 3.3 Galileo on Motion
OBJ: 6.3 Newton's Second Law
OBJ: 6.3 Newton's Second Law
OBJ: 6.3 Newton's Second Law
OBJ: 6.3 Newton's Second Law
OBJ: 6.2 Mass Resists Acceleration
OBJ: 6.2 Mass Resists Acceleration
TRUE/FALSE
31. ANS:
KEY:
32. ANS:
KEY:
33. ANS:
KEY:
34. ANS:
KEY:
35. ANS:
KEY:
36. ANS:
KEY:
37. ANS:
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38. ANS:
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39. ANS:
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40. ANS:
KEY:
OBJ: 3.3 Galileo on Motion
application
OBJ: 3.4 Newton's Law of Inertia
OBJ: 3.5 Mass—A Measure of Inertia
OBJ: 3.5 Mass—A Measure of Inertia
L1
OBJ:
knowledge
L1
OBJ:
knowledge
L2
OBJ:
comprehension
L1
OBJ:
knowledge
L2
OBJ:
3.1 Aristotle on Motion
6.1 Force Causes Acceleration
6.6 Free Fall Explained
6.5 Applying Force—Pressure
6.7 Falling and Air Resistance
PROBLEM
41. ANS:
100 N
PTS: 1
DIF: L2
OBJ: 3.5 Mass—A Measure of Inertia
KEY: weight | newtons
42. ANS:
6.0 N
BLM: application
PTS: 1
DIF: L2
KEY: weight | newtons
43. ANS:
1.5 N
OBJ: 3.5 Mass—A Measure of Inertia
BLM: application
PTS: 1
DIF: L2
KEY: gravity | weight
44. ANS:
170 kg
OBJ: 3.5 Mass—A Measure of Inertia
BLM: application
PTS: 1
DIF: L2
KEY: gravity | weight
45. ANS:
2.0 m/s2
OBJ: 3.5 Mass—A Measure of Inertia
BLM: application
PTS: 1
DIF: L2
KEY: force | acceleration
46. ANS:
2 m/s2
OBJ: 6.3 Newton's Second Law
BLM: application
PTS: 1
DIF: L2
KEY: force | friction | acceleration
47. ANS:
5.0 N
OBJ: 6.3 Newton's Second Law
BLM: application
PTS: 1
DIF: L2
KEY: force | acceleration
48. ANS:
1.3 m/s2
OBJ: 6.3 Newton's Second Law
BLM: application
PTS: 1
DIF: L2
KEY: force | acceleration
49. ANS:
7 m/s2
OBJ: 6.3 Newton's Second Law
BLM: application
PTS: 1
DIF: L2
KEY: resistance | acceleration
50. ANS:
10 m/s2
OBJ: 6.7 Falling and Air Resistance
BLM: application
PTS: 1
DIF: L2
KEY: force | acceleration
OBJ: 6.6 Free Fall Explained
BLM: application