HMH Unit i1 Review

Gordon throws a baseball into the air. It rises, stops when it reaches its greatest height, and then falls back to the ground. At what point does kinetic energy convert to potential energy?

• A. when the baseball is rising

• B. when the baseball is falling

• C. while the baseball sits on the ground

• D. while the baseball is stopped in the air

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Which describes energy and work?

• A. Only work is measured in joules.

• B. Energy remains constant when work is done.

• C. Work is a measure of how much energy a force transfers.

• D. When work is done on an object, no energy is transferred.

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Energy exists in different forms. Which of these forms of energy is stored in food?

• sound energy

• chemical energy

• mechanical energy

• electromagnetic energy

Priya lifts a box of apples from the ground to above her head. How was energy transferred?

• Energy is transferred from Priya to the box.

• Energy is transferred from the box to Priya.

• Energy is transferred from the ground to Priya.

• Energy is transferred from Priya to the ground.

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Three rocks are rolling down a hill at the same speed. Rock 1 has a mass of  1 kg; rock 2 has a mass of 1.5 kg, and rock 3 has a mass of 3 kg. Which rock has the most kinetic energy?

• 1

• 2

• 3

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Which form of energy is equal to the sum of an object’s kinetic and potential energy?

• nuclear

• chemical

• electrical

• mechanical

Gianna throws a baseball to her dad. He catches the ball in his mitt. Which describes the transfer of energy that occurred?

• Energy is transferred from the mitt to the ball.

• Energy is transferred from Gianna’s dad to Gianna.

• Energy is transferred from Gianna’s arm to the ball.

• Energy is transferred from Gianna’s arm to her dad’s mitt.

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A magnet attracts an iron nail. Which explains how energy is transferred between the objects?

• The magnet only receives energy, as the iron nail transfers energy to the magnet.

• The iron nail only receives energy, as the magnet transfers energy to the iron nail.

• The magnet transfers energy to the iron nail, and the iron nail transfers energy to the magnet.

• The magnet transfers energy to the air surrounding the iron nail, and the iron nail transfers energy to the magnet.

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Melanie is standing in a park holding a leash with her dog attached. When the dog sees a squirrel and runs ahead, what occurs?

• The dog exerts a force on Melanie, and a force is exerted on the dog from Melanie.

• The dog exerts a force on Melanie, and no force is exerted on the dog from Melanie.

• The dog does not exert a force on Melanie, but a force is exerted on the dog from Melanie.

• The dog does not exert a force on Melanie, and no force is exerted on the dog from Melanie.

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The motion of a fish swimming in a fish tank is an example of which type of energy?

• kinetic

• chemical

• potential

• gravitational energy

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