Physics Work and Energy Quiz

How much work is done on a 200-kg crate that is hoisted 2 m in a time of 4 s?

• 400 J

• 1000 J

• 1600 J

• 4000 J

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How much power is required to raise a 200-kg crate a vertical distance of 2 m in a time of 4 s?

• 400 W

• 1000 W

• 1600 W

• 4000 W

When work is done twice as quickly, then the power expended is

• half.

• the same.

• twice.

• 4 times as much.

If a charging elephant has kinetic energy, it must also have

• potential energy.

• momentum.

• work.

• All of these.

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When an increase in speed doubles, its kinetic energy

• increases, but less than doubles.

• doubles.

• more than doubles.

• depends on factors not stated.

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A dog and a mouse run down the road with the same KE. The faster moving one is the

• dog.

• mouse.

• Both run at the same speed.

• Can't say.

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When a car is braked to a stop, unless it is a hybrid, its kinetic energy is transformed to

• stopping energy.

• potential energy.

• energy of motion.

• heat.

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When two identical cars, one traveling twice as fast as the other, brake to a stop using old-fashioned brakes, the faster car will skid

• the same distance.

• twice as far.

• 4 times as far.

• more than 4 times as far.

Which of the following equations is most directly useful for solving a problem that asks for the distance a speeding vehicle skids in coming to a stop?

• F = ma

• Ft = Δ(mv)

• KE = 1/2 mv²

• Fd = Δ(1/2 mv²)

A shiny sports car at the top of a vertical cliff has a potential energy of 100 MJ relative to the ground below. Unfortunately, a mishap occurs and it falls over the edge. When it is halfway to the ground, its kinetic energy is

• 25 MJ.

• 50 MJ.

• about 100 MJ.

• more than 100 MJ.

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