Types of Energy

As a heavy metal ball rolls down a hill, it goes faster and faster. Which statement is true?

• A. The ball’s potential energy is changing to kinetic energy.

• B. The ball is gaining potential energy from the hill.

• C. The ball is rapidly losing kinetic energy as it rolls down the hill.

• D. The ball will continue gaining kinetic energy until it stops.

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Which example best illustrates kinetic energy?

• A. a light bulb that is turned on

• B. a car that is parked on top of a hill

• C. a comet that is flying through space

• D. a battery that is connected to a circuit

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Noah carried a skateboard up a hill and then rode the skateboard down the hill. When Noah reached the bottom of the hill, he rolled to a stop. When did Noah have the most potential energy?

• A. while carrying the skateboard up the hill

• B. while standing on the skateboard at the top of the hill

• C. while riding the skateboard down the hill

• D. while standing on the skateboard at the bottom of the hill

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Heat, light, and sound are all different forms of

• fuel.

• energy.

• matter.

• electricity.

At which labeled point does the diver have the least potential energy?

• 1

• 2

• 3

• 4

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The figure below shows a wagon that moves from point X to point Y. Which of the following best describes the wagon's change in energy as it coasts from point X to point Y?

• The wagon has the same kinetic energy at point Y and at point X.

• The wagon has more kinetic energy at point Y than at point X.

• The wagon has the same gravitational potential energy at point Y and at point X.

• The wagon has more gravitational potential energy at point Y than at point X.

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Which of the following describes the mechanical energy of a cart at rest at the top of a steep hill?

• The cart has no mechanical energy.

• The cart’s mechanical energy is all kinetic.

• The cart’s mechanical energy is all potential.

• The cart’s mechanical energy is half potential and half kinetic.

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A cart at the top of a hill is released and rolls down the hill. Which of the following describes the energy of the cart just as it reaches the bottom of the hill?

• The cart has no energy.

• The cart has maximum kinetic energy.

• The cart has maximum gravitational potential energy.

• The cart has equal gravitational potential and kinetic energy.

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The diagram below represents a bicyclist at the top of a hill, with four points labeled W, X, Y, and Z. Assume that the bicyclist does not apply the brakes as he rides down the hill. At which point will the bicyclist’s kinetic energy be closest to zero?

• point W

• point X

• point Y

• point Z

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Which of the following is an example of a form of energy?

• the air in a sealed jar

• the wire in a metal hanger

• the water in a small puddle

• the sound in a loud classroom

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