Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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1.
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What are the SI units for momentum?
a. | N·m | c. | kg·m/s | b. | J | d. | kg·m/s |
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2.
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A roller coaster climbs up a hill at 4 m/s and then zips down the hill at 30
m/s. The momentum of the roller coaster
a. | is greater up the hill than down the hill. | b. | is greater down the
hill than up the hill. | c. | remains the same throughout the
ride. | d. | is zero throughout the ride. |
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3.
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A rubber ball moving at a speed of 5 m/s hit a flat wall and returned to the
thrower at 5 m/s. The magnitude of the momentum of the rubber ball
a. | increased. | c. | remained the same. | b. | decreased. | d. | was not
conserved. |
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4.
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Which of the following equations can be used to directly calculate the change in
an object’s momentum?
a. | p = mv | c. | p = FDt | b. |  | d. | Dp =
FDt |
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5.
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If a force is exerted on an object, which statement is true?
a. | A large force always produces a large change in the object’s
momentum. | b. | A large force produces a large change in the object’s momentum only if the
force is applied over a very short time interval. | c. | A small force applied over a long time interval
can produce a large change in the object’s momentum. | d. | A small force always
produces a large change in the object’s momentum. |
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6.
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Which of the following situations is an example of a visible change in
momentum?
a. | A hiker walks through a spider’s web. | c. | A volleyball hits a mosquito in the
air. | b. | A car drives over a pebble. | d. | A baseball is hit by a bat. |
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7.
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Which of the following situations is an example of a significant change in
momentum?
a. | A tennis ball is hit into a net. | b. | A helium-filled balloon rises upward into the
sky. | c. | An airplane flies into some scattered white clouds. | d. | A bicyclist rides
over a leaf on the pavement. |
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8.
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Which of the following statements properly relates the variables in the equation
FDt = Dp?
a. | A large constant force changes an object’s momentum over a long time
interval. | b. | A large constant force acting over a long time interval causes a large change in
momentum. | c. | A large constant force changes an object’s momentum at various time
intervals. | d. | A large constant force does not necessarily cause a change in an object’s
momentum. |
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9.
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A 20 kg shopping cart moving at a velocity of 0.5 m/s collides with a store wall
and stops. The momentum of the shopping cart
a. | increases. | c. | remains the same. | b. | decreases. | d. | is conserved. |
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10.
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Two objects with different masses collide and bounce back after an elastic
collision. Before the collision, the two objects were moving at velocities equal in magnitude but
opposite in direction. After the collision,
a. | the less massive object had gained momentum. | b. | the more massive
object had gained momentum. | c. | both objects had the same
momentum. | d. | both objects lost momentum. |
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11.
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A soccer ball collides with another soccer ball at rest. The total momentum of
the balls
a. | is zero. | c. | remains constant. | b. | increases. | d. | decreases. |
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12.
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Two skaters stand facing each other. One skater’s mass is 60 kg, and the
other’s mass is 72 kg. If the skaters push away from each other without spinning,
a. | the lighter skater has less momentum. | b. | their momenta are equal but
opposite. | c. | their total momentum doubles. | d. | their total momentum
decreases. |
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13.
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Two swimmers relax close together on air mattresses in a pool. One
swimmer’s mass is 48 kg, and the other’s mass is 55 kg. If the swimmers push away from
each other,
a. | their total momentum triples. | c. | their total momentum
doubles. | b. | their momenta are equal but opposite. | d. | their total momentum
decreases. |
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14.
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In a two-body collision,
a. | momentum is always conserved. | b. | kinetic energy is always
conserved. | c. | neither momentum nor kinetic energy is conserved. | d. | both momentum and
kinetic energy are always conserved. |
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15.
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The law of conservation of momentum states that
a. | the total initial momentum of all objects interacting with one another usually equals
the total final momentum. | b. | the total initial momentum of all objects
interacting with one another does not equal the total final momentum. | c. | the total momentum
of all objects interacting with one another is zero. | d. | the total momentum of all objects interacting
with one another remains constant regardless of the nature of the forces between the
objects. |
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16.
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Two objects stick together and move with a common velocity after colliding.
Identify the type of collision.
a. | elastic | c. | inelastic | b. | nearly elastic | d. | perfectly
inelastic |
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17.
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Two balls of dough collide and stick together. Identify the type of
collision.
a. | elastic | c. | inelastic | b. | nearly elastic | d. | perfectly
inelastic |
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18.
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Which of the following best describes the momentum of two bodies after a
two-body collision if the kinetic energy of the system is conserved?
a. | must be less | c. | might also be conserved | b. | must also be
conserved | d. | is doubled in
value |
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19.
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Which of the following has the greatest momentum?
a. | a tortoise with a mass of 275 kg moving at a velocity of 0.55 m/s | b. | a hare with a mass
of 2.7 kg moving at a velocity of 7.5 m/s | c. | a turtle with a mass of 91 kg moving at a
velocity of 1.4 m/s | d. | a roadrunner with a mass of 1.8 kg moving at a
velocity of 6.7 m/s |
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20.
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A ball with a momentum of 4.0 kg·m/s hits a wall
and bounces straight back without losing any kinetic energy. What is the change in the ball’s
momentum?
a. | –8.0 kg·m/s | c. | 0.0 kg·m/s | b. | –4.0 kg·m/s | d. | 8.0 kg·m/s |
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