Forms of Energy

Latisha notices that when she rubs her hands together, they feel warm. Which of the following is the best explanation for why this happens?

• Heat energy is produced by friction.

• Sound energy is reflected into her hands.

• Light energy from the Sun heats her hands.

• Energy is absorbed from the air molecules by her hands.

Tags

NGSS.MS-PS1-4

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.

Tags

NGSS.MS-PS4-1

Ava is shining a flashlight at a mirror. Which of these happens when the light strikes the mirror?

• It goes around the mirror.

• It goes through the mirror.

• It spreads out on the mirror.

• It bounces back from the mirror.

Tags

NGSS.MS-PS4-2

Sara is looking at two vibrating metal strings. What can Sara observe about the string that is making a higher-pitch sound?

• It is longer than the other string.

• It is vibrating slower than the other string.

• It is shinier than the other string.

• It is vibrating faster than the other string.

Caleb is trying to name the different kinds of energies that play a part in making a flashlight work. What kind of energy is stored in a flashlight battery?

• Heat energy

• Light energy

• Chemical energy

• Mechanical energy

During a storm, the power goes out at Randall's house. His mother strikes a match to light a candle. As the match burns, it gives off light energy. What other form of energy does the burning match give off?

• Chemical energy

• Electrical energy

• Mechanical energy

• Thermal energy

Tags

NGSS.MS-PS1-4

NGSS.MS-PS1-2

This is a picture of a kind of pencil sharpener found in Lily's classroom. What kind of energy does Lily use to turn the handle of this pencil sharpener?

• Light energy

• Mechanical energy

• Electrical energy

• Thermal energy

Tags

NGSS.MS-PS3-5

What does the pencil in this picture show about light?

• Light is bent when it hits a hard object.

• Light is reflected when it hits a curved object.

• Light is bent when it passes from air into water.

• Light is reflected when it passes from air into water.

Tags

NGSS.MS-PS4-2

Look at the pictures below. Which of the following is an example of chemical energy?

• 
• 
• 
• 

Melissa's school rings a bell to alert students that it is time to start class. When the bell rings, it vibrates. The use of vibrations to send alert students is an example of which type of energy?

• Chemical

• Heat

• Light

• Sound