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18 Cards in this Set
- Front
- Back
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A moving object has
A. momentum. B. energy. C. speed. D. all of the above. |
D
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When the speed of an object is doubled, its momentum
A. remains unchanged in accord with the conservation of momentum. B. doubles. C. quadruples. D. decreases. |
B
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When the force that produces an impulse acts for twice as
much time, the impulse is A. not changed. B. doubled. C. increased by four times. D. decreased by half. |
B
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A cannonball shot from a cannon with a long barrel will
emerge with greater speed, because the cannonball receives a greater A. average force. B. impulse. C. both of the above. D. neither of the above. |
B
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A fast-moving car hitting a haystack or hitting a cement wall
produces vastly different results. Both experience A. the same change in momentum. B. the same impulse. C. the same force. D. A and B. |
D
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When a dish falls, will the change in momentum be less if it
lands on a carpet than if it lands on a hard floor? (Careful!) A. No, both are the same. B. Yes, less if it lands on the carpet. C. No, less if it lands on a hard floor. D. No, more if it lands on a hard floor. |
A
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Freight Car A is moving toward identical Freight Car B that
is at rest. When they collide, both freight cars couple together. Compared with the initial speed of Freight Car A, the speed of the coupled freight cars is A. the same. B. half. C. twice. D. none of the above. |
B
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If you push against a stationary brick wall for several
minutes, you do no work A. on the wall. B. at all. C. both of the above. D. none of the above. |
A
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Work is done in lifting a barbell. How much work is done in
lifting a twice-as-heavy barbell the same distance? A. Twice as much. B. Half as much. C. The same. D. Depends on the speed of the lift. |
A
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You do work when pushing a cart with a constant force. If
you push the cart twice as far, then the work you do is A. less than twice as much. B. twice as much. C. more than twice as much. D. zero. |
B
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A job can be done slowly or quickly. Both may require the
same amount of work, but different amounts of A. energy. B. momentum. C. power. D. impulse. |
C.
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Does a car hoisted for repairs in a service station have
increased potential energy relative to the floor? A. Yes. B. No. C. Sometimes. D. Not enough information. |
A
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Must a car with momentum have kinetic energy?
A. Yes, due to motion alone. B. Yes, when motion is nonaccelerated. C. Yes, because speed is a scalar and velocity is a vector quantity. D. No. |
A
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Consider a problem that asks for the distance a fastmoving
crate slides across a factory floor in coming to a stop. The most useful equation for solving this problem is A. F = ma. B. Ft = mv. C. KE = 1/2mv2. D. Fd = 1/2mv2. |
D
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The work done in braking a moving car to a stop is the
force of tire friction × stopping distance. If the initial speed of the car is doubled, the stopping distance is A. actually less. B. about the same. C. twice. D. none of the above. |
D
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Suppose the potential energy of a drawn bow is 50 joules,
and the kinetic energy of the shot arrow is 40 joules. Then A. energy is not conserved. B. 10 joules go to warming the bow. C. 10 joules go to warming the target. D. 10 joules is mysteriously missing. |
B
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In an ideal pulley system, a woman lifts a 100-N crate by
pulling a rope downward with a force of 25 N. For every one-meter length of rope she pulls downward, the crate rises A. 50 centimeters. B. 45 centimeters. C. 25 centimeters. D. none of the above. |
C
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A certain machine is 30% efficient. This means the
machine will convert A. 30% of the energy input to useful work—70% of the energy input will be wasted. B. 70% of the energy input to useful work—30% of the energy input will be wasted. C. as strange as it may seem, both of the above. D. none of the above. |
A
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