Transcript Momentum - college physics

Physics Quiz
MOMENTUM
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1. What type of quantity is momentum?
A. scalar
B. tensor
C. matrix
D. vector
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2. What are the SI units for momentum?
A. kg.m/s
B. kg.m/s2
C. kg.m
D. N.s2
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3. Which equation below correctly computes momentum?
A.
p  mx
B.
p  mx
C.
p  mx
D.
p  mv
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4. The net change in an object`s momentum is called _______ .
A. work
B. impulse
C. force
D. torque
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5. What is the magnitude of an object`s momentum if the object`s
mass is 5.0 kg and its speed is 6.0 m/s?
A. 90 kg·m/s
B. 180 kg·m/s
C. 15 kg·m/s
D. 30 kg·m/s
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6. If an object`s initial momentum is +20 kg·m/s and its final
momentum after 2 seconds is -20 kg·m/s, what average force acted
upon it?
A. -20 N
B. 20 N
C. 10 N
D. -80 N
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7. Impulse may be understood as __________ .
A. the slope of the tangent to the graph of Force vs Time at any
time t.
B. the area under a Force vs Velocity graph.
C. the area under a Momentum vs Time graph.
D. the area under a Force vs Time graph.
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8. When is the momentum of a single object conserved?
A. Momentum is always conserved.
B. Momentum is conserved when the net force acting on the
object is zero.
C. Momentum can only be conserved if the object is interacting
with another object.
D. The momentum of a single object can never be conserved.
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9. When is the total momentum of a system of interacting objects
conserved?
A. The total momentum of a system is conserved when the net
external force acting on the system is zero.
B. The total momentum of a system is conserved when the
internal forces add up to zero.
C. The total momentum is conserved when there are no internal
forces.
D. The total momentum of a system can not be conserved it the
objects are interacting.
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10. Suppose objects A and B are interacting and due to this
interaction object A experience a change in momentum of p. What
is the change in momentum experienced by object B?
A. p
B. 2p
C. -p
D. -2p
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11. While driving 60 mph on the highway a bug flying in the
opposite direction splats on the windshield right in front of you.
Which experienced the greater change in momentum, your car or
the bug?
A. Both the same but in opposite directions.
B. The bug because of its smaller mass.
C. The bug because of its greater change in velocity.
D. The bug because it changed directions.
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12. A collision involving objects that stick together is called ______ .
A. an elastic collision
B. a perfectly inelastic collision
C. a partially elastic collision
D. a head-on collision
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13. What is an elastic collision?
A. An elastic collision conserves kinetic energy.
B. In an elastic collision the objects stick together.
C. In an elastic collision momentum is not conserved.
D. In an elastic collision the colliding masses exchange
velocities.
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15. What factors cause injury during a car crash?
1. short stopping distance
2. short stopping time
3. large area of contact
4. staying in your seat
A. 1 and 3 above
B. 2 and 4 above
C. 2 and 3 above
D. 1 and 2 above
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15. What is true about the conservation of momentum during a
collision that takes place in two dimensions?
A. The change in momentum in the x-direction is equal and
opposite to the change in momentum in the y-direction.
B. Momenta in the x-direction and in the y-direction are both
conserved independently.
C. The change in momentum in the x-direction is equal to the
change in momentum in the y-direction.
D. The initial momentum in the x-direction must be equal to the
final momentum in the y-direction.
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16. Suppose you are stranded on a frozen lake where the ice is too
slippery to walk. All you have is a bag of gold coins. How can you get
off the ice before freezing to death?
A. Lay the gold coins on the ice and hope the sun heats them
enough to melt the ice. (Do you foresee a problem doing this?)
B. Use a coin as a signal mirror to attract attention. (Hope it`s
not cloudy.)
C. Throw the coins in the direction opposite from which you
wish to slide. Conservation of momentum will do the rest.
D. Give up, count your money, and die.
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