Conservation of Energy

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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NGSS.MS-PS3-5

NGSS.MS-PS3-4

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

• True

• False

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NGSS.MS-PS3-4

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

• Chemical

• Radiant

• Electrical

• Thermal

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NGSS.MS-PS1-4

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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NGSS.MS-PS3-5

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

• surrounding heat

• water

• friction

• fusion

Which of the following does NOT reduce friction?

• grease

• cotton

• oil

• graphite

A fire warms you by transferring _____ energy.

• potential

• thermal

• chemical

• nuclear

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A couple of friends decide they want to play Fortnite together on their Playstation 4.  When they turn the game on the TV, what kind of energy transfer is taking place?

• Heat to electric

• Electric to light

• Chemical to electric

• Electric to Light

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