Types of Energy

Which example demonstrates the use of chemical energy?

• a ball landing
• a burning fire
• a magnet holding a picture on the refrigerator
• a marble sitting at the bottom of a ramp

The Juno spacecraft is powered by the electricity it gets by using its solar panels to convert energy from the Sun. What forms of energy does the Sun provide the Juno spacecraft?

• sound and light
• light and heat
• chemical and heat
• chemical and magnetic

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 hill
• hearing a crackling sound on the cell phone during a lightning storm
• listening to a change in pitch from a guitar as a musician plays different strings

When a person looks into a mirror, how do the light rays behave to allow the person to see the image?

• The light rays are bent by the mirror.
• The light rays are stopped by the mirror.
• The light rays are reflected by the mirror.
• The light rays are absorbed by the mirror.

During math class, students were using a geoboard and a number of identical rubber bands to create geometric shapes. The rubber bands were stretched to different lengths. The students noticed that when plucked, the bands produced different sounds. Which statement explains this difference in sounds?

• The bands stretched tighter, vibrated faster, and created a higher pitch.
• The bands stretched tighter, vibrated slower, and created a higher pitch.
• The harder someone plucks a rubber band, the vibrations are slower, and the pitch is higher.
• The harder someone plucks a rubber band, the vibrations are very fast, and no sound is made.

Jayden rubs two sticks together to start a fire. Why does this process allow him to start a fire?

• When the sticks are rubbed together, they begin to vibrate to start the fire.
• When the sticks are rubbed together for a very long time, they release heat energy to start the fire.
• When the sticks are rubbed together, the rubbing releases electrical energy to start the fire.
• When the sticks are rubbed together, they release light energy to start the fire.

When does light stop traveling in a straight line?

• when it becomes brighter
• when it strikes an object
• when it moves through air
• when it passes through space

Faith wears a dark blue shirt outside on a sunny day. She feels hot. She changes into a light gray shirt. Now when she's outside she does not feel hot. How are the two shirts different?

• The dark blue shirt reflects more light.
• The dark blue shirt refracts more light.
• The dark blue shirt absorbs more light.
• The dark blue shirt produces more light.

Light can be refracted. In which of these is light being refracted?

• Seeing a straw in a glass appearing bent or broken.
• Looking in a mirror.
• Watching the lightning strike.
• Feeling the Sun's warmth.

Jett charges his cellphone battery overnight by plugging it into a wall outlet. What type of energy is used to power the cellphone?

• electrical and light
• electrical and chemical
• chemical and sound
• light and sound