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Chapter 2

- Motion in One Dimension
- Multiple Choice

1. What is the speed of an object at rest?

- a. 0.0 m/s
- b. 1.0 m/s
- c. 9.8 m/s
- d. 9.81 m/s

2. Which of the following is the equation for

average velocity?

- a. vavg ?x/ ?t
- b. vavg ?t/ ?x
- c. vavg ?x?t
- d. vavg (vi vf)/ 2

3. Which of the following situations represents a

negative displacement? (Assume positive position

is measured vertically upward along a y-axis.)

- a. A cat stands on a tree limb.
- b. A cat jumps from the ground onto a tree limb.
- c. A cat jumps from a lower tree limb to a higher

one. - d. A cat jumps from a tree limb to the ground.

4. Which of the following units is the SI unit of

velocity?

- a. meter
- b. metersecond
- c. meter per second
- d. second per meter

5. In the graph below, what is the correct

description of any location to the left of the

zero?

- a. negative displacement
- b. negative distance
- c. negative position
- d. negative change of displacement

6. In the graph below, a toy car rolls from 3 m

to 5 m. Which of the following statements is

true?

- a. xf 3 m
- b. xi 3 m
- c. ?x 3 m
- d. vavg 3 m/s

7. Suppose you are given a position versus time

graph. The slope of a line drawn tangent to a

point on the curve of this graph describes what

quantity?

- a. acceleration
- b. displacement
- c. instantaneous velocity
- d. position

8. According to the graph below, during which

interval is the cat at rest?

- a. 0.05.0 s
- b. 5.010.0 s
- c. 10.015.0 s
- d. 15.020.0 s

9. According to the graph below, the cat has the

fastest speed during which interval?

- a. 0.05.0 s
- b. 5.010.0 s
- c. 10.015.0 s
- d. 15.020.0 s

10. According to the graph below, during which

interval does the cat have the greatest positive

velocity?

- a. 0.05.0 s
- b. 5.010.0 s
- c. 10.015.0 s
- d. 15.020.0 s

11. Which of the following line segments on a

position versus time graph is physically

impossible?

- a. a horizontal line
- b. a straight line that slopes to the left
- c. a straight line that slopes to the right
- d. a vertical line

12. Acceleration is defined as

- a. a rate of displacement.
- b. the rate of change of displacement.
- c. the change in velocity.
- d. the rate of change of velocity.

13. Which of the following is the equation for

acceleration?

- a.
- b.
- c. a ?v?t
- d.

14. What is the SI unit of acceleration?

- a. m/s
- b. m2 /s
- c. m/s2
- d. ms2

15. If you know the acceleration of a car, its

initial velocity, and the time interval, which of

the following can you predict?

- a. the direction of the cars final velocity
- b. the magnitude of the cars final velocity
- c. the displacement of the car
- d. all of the above

16. When a cars velocity is positive and its

acceleration is negative, what is happening to

the cars motion?

- a. The car slows down.
- b. The car speeds up.
- c. The car travels at constant speed.
- d. The car remains at rest.

17. When a cars velocity is negative and its

acceleration is negative, what is happening to

the cars motion?

- a. The car slows down.
- b. The car speeds up.
- c. The car travels at constant speed.
- d. The car remains at rest.

18. The graph below describes the motion of a

cyclist. The graph illustrates that the

acceleration of the cyclist

- a. is constant.
- b. decreases.
- c. increases.
- d. is zero.

19. The graph below describes the motion of a

cyclist. During the interval shown, the cyclist

is

- a. slowing down.
- b. speeding up.
- c. traveling at the same speed.
- d. at rest.

20. What does the graph below illustrate about

acceleration?

- a. The acceleration varies.
- b. The acceleration is zero.
- c. The acceleration is constant.
- d. The acceleration increases then becomes

constant.

21. In the graph below, how does the acceleration

at A compare with the acceleration at B?

- a. The acceleration at A is positive and less

than the acceleration at B. - b. The acceleration at B is positive and less

than the acceleration at A. - c. The accelerations at A and B are each zero.
- d. The accelerations at A and B cannot be

determined.

22. Which of the following line segments on a

velocity versus time graph is physically

impossible?

- a. horizontal line
- b. straight line with positive slope
- c. straight line with negative slope
- d. vertical line

23. The graph below describes the motion of a

ball. At what point does the ball have an

instantaneous velocity of zero?

- a. A
- b. C
- c. D
- d. none of the above

24. The graph above describes the motion of a

ball. At what point is the speed of the ball

equal to its speed at B?

- a. A
- b. C
- c. D
- d. none of the above

25. The graph below describes the motion of a

ball. At what point is the velocity of the ball

equal to its velocity at

- a. A
- b. C
- c. D
- d. none of the above

26. The motion of a ball on an inclined plane is

described by the equation . Which

of the following quantities must have a value of

zero?

- a. x i
- b. xf
- c. vi
- d. t f

27. Acceleration due to gravity is also called

- a. negative velocity.
- b. displacement.
- c. free-fall acceleration.
- d. instantaneous acceleration.

28. Which of the following statements applies to

the motion of a ball rising and then falling in

free fall?I. The ball has constant acceleration

as it moves upward.II. The ball has constant

acceleration at the top of its path.III. The

ball has constant acceleration as it moves

downward

- a. I only
- b. III only
- c. I and III
- d. I, II, and III

29. A baseball catcher throws a ball vertically

upward and catches it in the same spot as it

returns to the mitt. At what point in the balls

path does it experience zero velocity and nonzero

acceleration at the same time?

- a. midway on the way up
- b. at the top of its path
- c. the instant it leaves the catchers hand
- d. the instant before it arrives in the catchers

mitt

30. When there is no air resistance, objects of

different masses dropped from rest

- a. fall with equal accelerations and with equal

displacements. - b. fall with different accelerations and with

different displacements. - c. fall with equal accelerations and with

different displacements. - d. fall with different accelerations and with

equal displacements.

31. Objects that are falling toward Earth in free

fall move

- a. faster and faster.
- b. slower and slower.
- c. at a constant velocity.
- d. slower then faster.

32. Which would hit the ground first if dropped

from the same height in a vacuuma feather or a

metal bolt?

- a. the feather
- b. the metal bolt
- c. They would hit the ground at the same time.
- d. They would be suspended in a vacuum.

33. Which would fall with greater acceleration in

a vacuuma leaf or a stone?

- a. the leaf
- b. the stone
- c. They would accelerate at the same rate.
- d. It is difficult to determine without more

information.

34. Two students are standing on a fire escape,

one twice as high as the other. Simultaneously,

each drops a ball. If the first ball strikes the

ground at time ?t , when will the second ball

strike the ground? (Disregard air resistance.

Assume a -g -9.81 m/s2 .)

- a. ?t2 4?t1
- b. ?t2 2?t1
- c. ?t2 v2?t1
- d. ?t2 5/4 ?t1

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