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Hot Seat Review Game

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c) kg m 2 /s 2 The unit for work is Joules. What is an equivalent unit for work using meters, kilograms, and seconds? a)kg m/s 2 b)kg m 2 /s c)kg m 2 /s 2 d)kg 2 m/s 2

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Stay the same If someone pushes a stationary brick wall ten times harder than they did yesterday, what happens to the work done? (Increase, Decrease or Stay the same.)

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They are the same. A 4.0 kg mass is moving with a speed 2.0 m/s. A 1.0 kg mass is moving with speed 4.0 m/s. Both objects encounter the same constant braking force and are brought to rest. How do their stopping distances compare? ΔKE = W ΔKE = W ½ 4(2) 2 = Fd½ 1(4) 2 = Fd 8/F = d 8/F = d

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1/4 An object hits a wall and bounces back with half its original speed. What is the ratio of the final kinetic energy to the initial kinetic energy?

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735 W At what rate is a 60 kg boy using energy when he runs up a flight of stairs 10 m high in 8 seconds?

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80 J W = ΔKE = ½ mv 2 = ½ (10)(4 2 ) A 10 kg mass is moving with a speed of 4.0 m/s. How much work is required to stop the mass?

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Four times farther. You slam on the brakes of your car and skid a certain distance. If you had been traveling twice as fast, what distance would the car have skidded under the same conditions?

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a) Momentum An object that has kinetic energy must have: (mark all that apply) a)Momentum b)Acceleration c)A force applied to it d)Potential Energy

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a) KE increases and PE decreases An acorn falls from a tree. Compare its kinetic energy to its potential energy. a)KE increases and PE decreases b)KE decreases and PE decreases c)KE increases and PE increases d)KE decreases and PE increases

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2 to 1 Car J moves twice as fast as car K and has half the mass of car K. What is the ratio of car Js kinetic energy to car Ks kinetic energy?

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They rise to the same height. A lightweight object and a very heavy object are sliding with equal speeds along a level frictionless surface. They both slide up the same frictionless hill. Which rises to a greater height?

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3.7 m/s A 1.0 kg ball falls to the floor. When it is 0.70 m above the floor, its potential energy exactly equals its kinetic energy. How fast is it moving?

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PE max > KE max A ball falls from the top of a building, through the air (air friction is present) to the ground below. How does the KE just before striking the ground compare to the PE at the top of the building?

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2,685,600 J How many joules of energy are used by a 1.0 hp motor that runs for 1.0 hr? (1 hp = 746 W)

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Four If a skaters speed increases so he has twice the momentum, then his kinetic energy increases by what factor?

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hydrogen gas Consider molecules of hydrogen gas and molecules of heavier oxygen gas that have the same kinetic energy. Which molecules have a greater speed?

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