Energy Conversions

What is an energy conversion?

• when one form of energy stays the same

• when you stretch a rubber band and give it potential energy

• a change from one form of energy to another

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One form of energy can sometimes change into more than one other energy form.

• True

• False

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As a skateboarder travels up a half-pipe, how does his energy change?

• His potential energy changes into kinetic energy.

• His kinetic energy changes into potential energy.

• His chemical energy changes into kinetic energy.

• His thermal energy changes into potential energy.

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How does a rubber band gain elastic potential energy?

• By keeping it in your hand

• By laying it on a table

• By throwing it

• By stretching it

Your body changes chemical energy from food into which forms of energy?

• mechanical (move muscles)

• thermal (body temperature)

• nuclear (energy)

• electrical (brain)

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Light energy from the sun is converted into what kind of energy by green leaves?

• nuclear energy

• chemical energy

• its stays light energy

• thermal energy

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Photosynthesis is a chemical reaction in plants that changes light energy into chemical energy.

• true

• false

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Energy conversions are very rare.

• True

• False

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NGSS.MS-PS3-5

You use electrical energy all of the time. Some examples of when you use electrical energy are

• Pedaling a bike

• Listening to the radio

• Making toast

• Taking a picture

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What are two ways a machine converts energy?

• Changing the size and/or direction of the force that does the work (simple machines)

• Photosynthesis

• Changing energy into a form that you need (like a stove)

• Eating food