Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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1.
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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. |
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2.
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Which of the following units is the SI unit of velocity?
a. | meter | c. | meter per second | b. | meter·second | d. | second per meter |
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3.
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According to the graph above, during which interval is the cat at rest?
a. | 0.0–5.0 s | c. | 10.0–15.0 s | b. | 5.0–10.0 s | d. | 15.0–20.0
s |
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4.
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According to the graph above, the cat has the fastest speed during which
interval?
a. | 0.0–5.0 s | c. | 10.0–15.0 s | b. | 5.0–10.0 s | d. | 15.0–20.0
s |
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5.
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Which of the following line segments on a position versus time graph is
physically impossible?
a. | a horizontal line | c. | a straight line that slopes to the right | b. | a straight line that
slopes to the left | d. | a
vertical line |
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6.
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Acceleration is defined as
a. | a rate of displacement. | c. | the change in
velocity. | b. | the rate of change of displacement. | d. | the rate of change of
velocity. |
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7.
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What is the SI unit of acceleration?
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8.
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When a car’s velocity is positive and its acceleration is negative, what
is happening to the car’s motion?
a. | The car slows down. | c. | The car travels at constant speed. | b. | The car speeds
up. | d. | The car remains at
rest. |
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9.
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When a car’s velocity is negative and its acceleration is negative, what
is happening to the car’s motion?
a. | The car slows down. | c. | The car travels at constant speed. | b. | The car speeds
up. | d. | The car remains at
rest. |
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10.
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In the graph above, 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. |
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11.
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The graph above describes the motion of a ball. At what point does the ball have
an instantaneous velocity of zero?
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12.
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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 | c. | D | b. | C | d. | none of the
above |
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13.
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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?
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14.
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Acceleration due to gravity is also called
a. | negative velocity. | c. | free-fall acceleration. | b. | displacement. | d. | instantaneous acceleration. |
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15.
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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 |
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16.
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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 ball’s 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 catcher’s hand | d. | the instant before it arrives in the
catcher’s mitt |
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17.
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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. |
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18.
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Which would hit the ground first if dropped from the same height in a
vacuum—a 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. |
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19.
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Which would fall with greater acceleration in a vacuum—a 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. |
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20.
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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 Dt , when will the second ball strike the ground? (Disregard
air resistance. Assume a = -g = -9.81 m/s  .)
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