Final Exam Study Guide

Potential energy means:

• The energy an object has due to its motion

• The energy stored in an object due to its position or state

• The energy released during a chemical reaction

• The energy produced by electrical currents

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Kinetic energy means:

• The energy an object has due to its motion

• The energy stored in an object at rest

• The energy released during a chemical reaction

• The energy produced by sound waves

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When something falls, the energy stays the same, increases, or decreases.

• Stays the same

• Increases

• Decreases

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Which of the following has the greatest potential energy? (A, B, or C) Why?

• A

• B

• C

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What is the rate at which work is done?

• Power

• Energy

• Force

• Velocity

A car with a mass of 1,200 kg is traveling at 20 m/s. What is its kinetic energy?

• 240,000 J (Joules)

• 120,000 J (Joules)

• 480,000 J (Joules)

• 60,000 J (Joules)

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An object moving at 10 m/s has 200 joules of kinetic energy. What is its mass?

• 4 kg

• 2 kg

• 8 kg

• 20 kg

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A 3 kg object has 54 joules of kinetic energy. What is its speed?

• 6 m/s

• 3 m/s

• 9 m/s

• 12 m/s

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Two kids are racing bikes. One bike and rider together weigh 70 kg and are moving at 6 m/s. The other combo weighs 60 kg and is moving at 7 m/s. Who has more kinetic energy?

• The 60 kg combo moving at 7 m/s has more kinetic energy.

• The 70 kg combo moving at 6 m/s has more kinetic energy.

• Both have the same kinetic energy.

• Neither has any kinetic energy.

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A roller coaster car (mass = 500 kg) starts from rest at the top of a hill and reaches the bottom moving at 15 m/s. How much kinetic energy did it gain?

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