Forms of Energy Review

Which of the following is an example of observing mechanical energy?

• Seeing a firecracker making sparks in the night sky

• Watching a large rock rolling down the side of a mountain

• Hearing a crackling sound on a cell phone during a lightning storm

• Listening to a change in pitch from a car horn while it moves away

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One type of energy is the result of waves that travel through matter and cause particles in the matter to vibrate. Which type of energy is it?

• Chemical

• Electrical

• Mechanical

• Sound

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Ellen is putting new batteries in her flashlight. Which type of energy is stored in the batteries?

• Chemical

• Mechanical

• Light

• Heat

A student turns on an electric lamp. She notices that the energy from the electricity is transformed into two other forms. What are these two forms?

• Light and heat

• Light and mechanical

• Light and motion

• Light and electricity

A student plugs headphones into a computer to listen to a lesson on the Internet. Which of the following best describes the energy transformation that occurs from the computer to the student's headphones?

• Mechanical to light

• Sound to electrical

• Electrical to sound

• Electrical to light

A student asks her mother to help her make tea. They put a tea kettle on a hotplate and turn it on. After about 10 minutes, the tea kettle starts to whistle. What energy transformations have taken place?

• Sound to heat to light

• Electric to sound to light

• Electric to heat to sound

• Electric to chemical to sound

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All of the appliances transform electrical energy into other forms of energy. Which of the following shows an appliance that transforms electrical energy into heat energy?

• Blender

• Battery

• Keyboard/Piano

• Iron

Batteries store energy in the form of chemical energy. The chemical energy is converted into electrical energy, which can be used to create motion. Which of these is a battery-powered item where the energy of the battery is used to create motion?

• Item A

• Item B

• Item C

• Item D

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Jack is completing an experiment comparing the length of a guitar string to the pitch it produces. He makes a chart of his results. What can Jack conclude about how the length of the guitar string affects the pitch?

• The longer string will vibrate quickly and produce a low-pitched sound.

• The shortest string will vibrate quickly and produce a high-pitched sound.

• The shortest string will vibrate slowly and produce a low-pitched sound.

• The longer string will vibrate slowly and produce a high-pitched sound.

Jason stretches a rubber band between his fingers, as shown below. When he plucks the rubber band, it makes a sound. Which of the following best explains why the rubber band makes a sound when Jason plucks it?

• It heats the air.

• It vibrates the air.

• It absorbs energy from the air.

• It releases molecules into the air.

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