Multiple Choice
Identify the
letter of the choice that best completes the statement or answers the question.
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1.
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Which of the
following units are used to measure free fall?
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2.
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A race car
accelerates from 0 m/s to 30.0 m/s with a displacement of 45.0 m. What is the vehicle's
acceleration? a. | 5.00
m/s2 | c. | 2.00
m/s2 | b. | 15.0 m/s2 | d. | 10.0 m/s2 | | | | |
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3.
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A rock is
thrown straight upward with an initial velocity of 24.5 m/s where the downward acceleration due to
gravity is 9.81 m/s2. What is the rock's displacement after 1.00 s? a. | 24.5
m | c. | 29.4
m | b. | 19.6
m | d. | 9.81
m | | | | |
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4.
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When
velocity is positive and acceleration is negative, what happens to the object’s
motion? a. | The object remains at
rest. | c. | The object speeds
up. | b. | Nothing happens to the
object. | d. | The object slows
down. | | | | |
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5.
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A marble
accelerates from rest at a constant rate and travels for a total displacement of 44 m in 20.0 s. What
is the average velocity of the marble? a. | 4.4 m/s | c. | 0.0 m/s | b. | 1.1 m/s | d. | 2.2 m/s | | | | |
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6.
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What does the graph
above illustrate about acceleration? a. | The acceleration varies. | b. | The acceleration
increases then becomes constant. | c. | The acceleration is zero. | d. | The acceleration is
constant. | | |
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7.
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A tourist
accidentally drops a camera from a 40.0 m high bridge. If g = 9.81 m/s2 and air
resistance is disregarded, what is the speed of the camera as it hits the water? a. | 784
m/s | c. | 31.0
m/s | b. | 56.0
m/s | d. | 28.0
m/s | | | | |
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8.
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Acceleration
due to gravity is also called a. | negative velocity. | c. | instantaneous velocity. | b. | free-fall
acceleration. | d. | displacement. | | | | |
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9.
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A rock is
thrown straight upward with an initial velocity of 19.6 m/s where the downward acceleration due to
gravity is 9.81 m/s2. What time interval elapses between the rock's being thrown and its
return to the original launch point? a. | 10.0 s | c. | 5.00 s | b. | 4.00 s | d. | 8.00 s | | | | |
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10.
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A toy car is
given an initial velocity of 5.0 m/s and experiences a constant acceleration of 2.0 m/s2.
What is the final velocity after 6.0 s? a. | 17 m/s | c. | 10.0 m/s | b. | 12 m/s | d. | 16 m/s | | | | |
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11.
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Which of the
following is the expression for acceleration?
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12.
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A shopping
cart given an initial velocity of 2.0 m/s undergoes a constant acceleration of 3.0 m/s2.
What is the magnitude of the cart's displacement after the first 4.0 s of its
motion? a. | 10.0
m | c. | 55
m | b. | 80.0
m | d. | 32
m | | | | |
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13.
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A rock is
thrown from the top of a cliff with an initial speed of 12 m/s. If the rock hits the ground after 2.0
s, what is the height of the cliff?
(Disregard air resistance. g = 9.81 m/s2.)
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14.
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A soccer
ball is kicked horizontally. What is its average speed if its displacement is 21.0 m after 4.00
s? a. | 14.4
m/s | c. | 2.63
m/s | b. | 8.75
m/s | d. | 5.25
m/s | | | | |
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15.
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Objects that
are falling toward Earth move a. | slower then faster. | c. | slower and slower. | b. | faster and
faster. | d. | at a constant
velocity. | | | | |
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16.
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A curious
kitten pushes a ball of yarn at rest with its nose, displacing the ball of yarn 17.5 cm in 2.00 s.
What is the acceleration of the ball of yarn? a. | 8.75 cm/s2 | c. | 4.38 cm/s2 | b. | 14.4
cm/s2 | d. | 11.0
cm/s2 | | | | |
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17.
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When there
is no air resistance, objects of different masses a. | fall with different accelerations with similar
displacements. | b. | fall with equal accelerations with different
displacements. | c. | fall with different accelerations with different
displacements. | d. | fall with equal accelerations with similar
displacements. | | |
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18.
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A baseball
is released at rest from the top of the Washington Monument. It hits the ground after falling for
6.00 s. What was the height from which the ball was dropped?
(Disregard air resistance. g = 9.81 m/s2.) a. | 115
m | c. | 177
m | b. | 150.0
m | d. | 210.0
m | | | | |
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19.
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Acceleration
is a. | velocity. | c. | displacement. | b. | the rate of change of velocity. | d. | the rate of change of displacement. | | | | |
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20.
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The 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. | the instant it leaves
the catcher’s hand | b. | midway on the way up | c. | the instant before it
arrives in the catcher’s mitt | d. | at the top of its trajectory | | |
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21.
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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. | They would be suspended
in a vacuum. | b. | the feather | c. | They would hit the ground at the same time. | d. | the metal
bolt | | |
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22.
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Human
reaction time is usually about 0.20 s. If your lab partner holds a ruler between your finger and
thumb and releases it without warning, how far can you expect the ruler to fall before you catch it?
(Disregard air resistance. g = 9.81 m/s2.) a. | at least 4.0
cm | c. | at least 16.0
cm | b. | at least 9.8
cm | d. | at least 19.6
cm | | | | |
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23.
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Which would
fall with greater acceleration in a vacuum, a leaf or a stone? a. | It is difficult to
determine without more information. | b. | the stone | c. | They would accelerate at the same rate. | d. | the
leaf | | |
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24.
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A coin
released at rest from the top of a tower hits the ground after falling 1.5 s. What is the speed of
the coin as it hits the ground? (Disregard air
resistance. g = 9.81 m/s2.) a. | 39
m/s | c. | 15
m/s | b. | 31
m/s | d. | 21
m/s | | | | |
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25.
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A sports car
accelerates at a constant rate from rest to a speed of 27.8 m/s in 8.00 s. What is the displacement
of the sports car in this time interval? a. | 55.0 m | c. | 222 m | b. | 77.0 m | d. | 111 m | | | | |
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26.
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Which of the
following is a value for the acceleration of objects in free fall? a. | –9.80
m/s2 | c. | –9.81
m/s2 | b. | 9.80 m/s2 | d. | 9.81 m/s2 | | | | |
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27.
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What does the graph
above illustrate about acceleration? a. | The acceleration is constant. | b. | There is not enough
information to answer. | c. | The acceleration is zero. | d. | The acceleration
decreases. | | |
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Short Answer
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28.
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What is the
acceleration of an object thrown upward? What is its acceleration as it free falls?
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Displacement
(m) | Time
(s) | 2.0 | 0.0 | 4.0 | 6.0 | 6.0 | 10.0 | | |
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29.
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Construct a
graph of position versus time using the data in the table above. What value is represented by the
slope of a graph? Find the slope between Dt = 1 s and Dt = 2 s. Be sure to use appropriate SI units.
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