Energy Review - 7th Grade

The diagram shows two bowling balls of equal mass. Ball A is resting near the edge of a shelf. Ball B is resting on the ground below. Which of these statements best describes the diagram above?

• Ball A has more kinetic energy than Ball B.

• Ball B has more kinetic energy than Ball A.

• Ball A has more potential energy than Ball B.

• Ball B has more potential energy than Ball A.

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

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

• The ball is gaining potential energy from the hill.

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

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

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Which example best illustrates kinetic energy?

• a light bulb that is turned on

• a car that is parked on top of a hill

• a comet that is flying through space

• a battery that is connected to a circuit

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NGSS.MS-PS3-1

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?

• while carrying the skateboard up the hill

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

• while riding the skateboard down the hill

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

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Energy appears in many forms. What form of energy is lightning?

• electrical energy

• mechanical energy

• magnetic energy

• sound energy

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Heat, light, and sound are all different forms of

• fuel

• energy

• matter

• electricity

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The diagram below represents a diver's motion from the top of a high diving board into a pool of water. At which labeled point does the diver have the least potential energy?

• 1

• 2

• 3

• 4

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A skateboarder travels from location 1 to location 4 as shown below. At which location does the skateboarder have the most kinetic energy and the least potential energy?

• A. 1

• B. 2

• C. 3

• D. 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?

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

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

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

• D. 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?

• A. The cart has no mechanical energy.

• B. The cart's mechanical energy is all kinetic.

• C. The cart's mechanical energy is all potential.

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

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