Chapter 7 Energy

Which is an example of potential energy changing to kinetic energy?

• Roller coaster car at the top of the hill and then rolls down.

• One dog running faster than another dog.

• A car stops at a stop sign.

• A skier rides the chairlift to the top of a mountain.

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In the afternoon when the sun is in the western sky, a tree's shadow stretches to the ________________.

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Most objects that give off light also give off heat.

• True

• False

Something that makes a loud sound vibrates ________________.

• at a high frequency

• at a low frequency

• with a lot of energy

• with a little energy

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Which statement is TRUE about a white shirt.

• The shirt refracts any light that it hits.

• The shirt reflects white light only.

• The shirt reflects all colors of light.

• The shirt absorbs all colors of light.

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Plastic is a conductor.

• False

• True

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A violin has a higher pitch than a cello. What could be a reason for this?

• Cellos are played at a higher volume violins.

• The strings of the violin vibrate more slowly.

• The violin has longer, thicker strings.

• The cello has longer, thicker strings.

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A scientist wires 3 light bulbs together with a battery. One of the bulbs burn out. What is true of the remaining bulbs.

• One bulb will stay lit.

• None of the light bulbs will stay lit.

Pick 2 reasons why a flashlight may stop working.

• The batteries died or ran out of energy.

• The lightbulb is burnt out.

• The lightbulb is old.

• The batteries are cheap.