7th Gr M3L3 Law of Conservation of Energy Test

When you put on the brakes of a bicycle, friction causes some of the mechanical energy to transfer to thermal energy.

• True

• False

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According to the law of conservation of energy, energy can be created and destroyed.

• True

• False

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In every energy transformation, some energy is always “lost” as ____ energy.

• chemical

• radiant

• electrical

• thermal

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According to the law of conservation of energy, the total amount of energy in the universe ____.

• remains constant

• changes constantly

• increases

• decreases

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Work _____ energy.

• reduces

• reflects

• transfers

• stops

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Which equation is correct?

• mechanical energy = kinetic energy – potential energy

• mechanical energy = potential energy – kinetic energy

• mechanical energy = kinetic energy + potential energy

• mechanical energy = kinetic energy × potential energy

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When two surfaces interact, some mechanical energy leaves the system as thermal energy due to _____.

• surrounding heat

• water

• friction

• fusion

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Which of the following does NOT reduce friction?

• grease

• cotton

• oil

• graphite

A fire warms you by transferring _____ energy.

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Which claim BEST supports Katie's & the class' findings about the experiment showing how kinetic energy and potential energy can change as a ball rolls down a set of steps.

• As the ball rolls from the top of the stairs to the bottom of the stairs, there is a corresponding change in the amount of potential into kinetic energy.

• The ball’s kinetic energy will decrease as it rolls, and the potential energy will increase as the ball rolls down the steps.

• The speed of the ball would decrease as it approached the bottom of the stairs.

• The potential energy would have been less if there had been more steps and the kinetic energy would have been more if there were fewer steps.

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