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Date
Class
Period
______
Chapter 12 Review Problems
1.
A.
B.
C.
D.
Which is not a force?
friction
gravity
Momentum
Weight
2.
A.
B.
C.
D.
You push on a box and are unable to move it. What force opposes your push?
static friction
rolling friction
sliding friction
air resistance
3.
A.
B.
C.
D.
Air resistance depends on
the velocity of a moving object.
the weight of a moving object.
the mass of a moving object.
the inertia of a moving object.
4.
A.
B.
C.
D.
What force besides gravity acts on a projectile?
weak nuclear
Electrical
Magnetic
air resistance
5.
A.
B.
C.
D.
Newton's first law of motion is sometimes called the law of
inertia.
conservation.
Momentum.
resistance.
6.
A.
B.
C.
D.
A change in which of the following affects the weight of an object?
Momentum
Velocity
acceleration due to gravity
friction
7. Which represents Newton's second law?
A.
B.
C. F = mv
D. F = 0
Chapter 12 Review Problems
Page 1 of 5
Name
Date
Class
8. For every action force there is a
A. reaction force.
B. net force.
C. friction force.
D. unbalanced force.
Period
9.
A.
B.
C.
D.
______
Momentum depends upon
force only.
velocity and friction.
weight and mass.
mass and velocity.
10. What force holds the nucleus together? (12.4)
A. magnetic
B. strong nuclear
C. gravitational
D. centripetal
11. Which of the following correctly lists friction types (excluding fluid friction) from weakest to
strongest?
A. sliding, static, magnetic
B. static, rolling, sliding
C. weak, strong, nuclear
D. rolling, sliding, static
E. static, sliding, rolling
12. Which statement about an object falling at terminal velocity is TRUE?
A. Unbalanced forces act on the object.
B. The net force acting on the object is zero.
C. The object is accelerating.
D. The object is traveling in a circular path.
E. No fluid friction acts on the object.
13. An object changes direction as it moves. Which of the following is FALSE?
A. The acting net force is not zero.
B. An unbalanced force acts on the object.
C. The object is accelerating.
D. A centripetal force must act on the object.
E. The object's inertia remains unchanged.
Chapter 12 Review Problems
Page 2 of 5
Name
Date
Class
Period
______
14. Which has the greatest momentum?
A. a huge boulder at rest
B. a small pebble that is tossed into the air
C. a baseball after it is hit with a bat
D. a small pebble at rest
E. a car traveling on a highway
Use the diagram below to answer Questions 15 and 16. The diagram shows how five forces act on a
wooden crate as it slides across the floor.
15. If A = 60 N, B = 20 N, C = 30 N, D = 30 N, and E = 30 N, which of the following statements is
FALSE?
A. A net force of 50 N acts on the crate and the crate moves to the right.
B. The crate accelerates to the right.
C. The net force in the vertical direction is zero.
D. Force C represents the weight of the crate.
E. Forces C and E represent balanced forces acting in the vertical direction.
16. Which force represents the sliding friction force?
A. A
B. B
C. C
D. D
E. E
17. Three forces act on a wooden crate that is initially at rest as shown below. Determine the net
force acting on the crate and describe the resulting motion of the crate.
18. Suppose two 4-newton forces act on an object in the same direction. What is the net force on
the object?
19. Five different forces act on an object. Is it possible for the net force on the object to be zero?
Explain.
Chapter 12 Review Problems
Page 3 of 5
Name
Date
Class
Period
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20. What happens to an object when an unbalanced force acts on it?
21. You push harder and harder on a box until it begins sliding across the floor. Which was the
stronger of the forces acting on the box, static friction or sliding friction?
22. How do ball bearings reduce friction in machinery?
23. Explain why a falling object subjected to Earth's gravity does not continue to accelerate forever.
24. What is the difference between mass and weight?
25. What is an action-reaction pair?
26. What must you know to determine which of two vehicles traveling at the same velocity, has the
greater momentum?
27. What force is responsible for your socks sticking together after they have been in a clothes
dryer? (12.4)
28. What particles do the strong and weak nuclear forces act on? (12.4)
29. What force is responsible for the orbits of the planets in the solar system? (12.4)
30. When shooting an arrow at a target, why is it advisable to aim above the bull's-eye rather than
directly at it?
31. When a tennis player practices by hitting a ball against a wall, which of Newton's laws of motion
is the player making use of?
32. The moon's gravity is only one-sixth that of Earth's. Explain how the weight and mass of the
same object differs between the two locations.
Chapter 12 Review Problems
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Name
Date
Class
Period
______
33. The graph to the right shows the relationship between the force
acting on an object and the acceleration of the object. What is the
acceleration of the object when a 3-newton force acts on it? What is
the object's mass?
34. Consider two rocks with masses of 1 and 10 kilograms. What is the relation between their
inertias? Between their masses? Between their weights on Earth?
35. During a fuel-economy test of a sports car, the car achieved more miles per gallon of gasoline
when its convertible top was up. Explain how the convertible top being up or down is related to the
car's fuel economy.
36. What are the two ways in which the acceleration of an object can be increased?
37. A 100-kg crate, sliding on a floor, is brought to a stop by 25-N force. What is the deceleration of
the crate?
38. What is the momentum of an 80-kg runner moving at the speed of 2.5 m/s?
39. What is the weight on Earth of a girl with a mass of 30 kg? The acceleration due to gravity on
Earth is 9.8 m/s2.
40. Hovercrafts, which move over water on a cushion of air, can achieve greater speeds than
ordinary boats. Explain why this is possible.
41. Imagine that you have designed clothing for professional bicycle racers. How could you judge
the effectiveness of the clothing at improving a racer's speed?
42. Explain how you could determine the force of static friction acting on a box that is resting on a
rough floor.
43. Consider an automobile cruising at a constant speed on the highway. Write a paragraph
summarizing the forces acting on the car. Be sure to include the force supplied by the engine and at
least two types of friction acting on the car.
Chapter 12 Review Problems
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