Unit 9 Energy

Unit 9 Energy

Different forms of energy

There are different kinds of energy. Energy comes from different sources.

Multiple Choice

What is energy?

• It is the ability to cause change in matter.

• It is energy that makes things move.

Kinetic energy

Kinetic energy is the energy of motion. Objects that are moving are objects in motion.

Potential energy

Potential energy is the energy something has because of its position or condition.

Multiple Choice

Which picture shows an example of potential energy?

Mechanical energy

Mechanical energy is the total potential energy and kinetic energy of an object.

Multiple Choice

Can you have mechanical energy if you don't have potential energy?

• Yes

• No

Light energy

Light energy is produced and used in different ways. Light is a form of energy that can travel through space. Plants use light energy to make food. People change electrical energy into light energy.

Sound energy

Sound energy is another form of energy. Sound energy is made when something moves back and forth. This back and forth motion is called vibration.

Multiple Select

What sources of energy are shown here?

• mechanical energy

• sound energy

• light energy

• chemical energy

Chemical energy

Chemical energy is energy that can be released by a chemical change.

Electrical energy

Electrical energy is energy that comes from an electric current. Most electrical energy is made by burning fossil fuels.

Multiple Select

What kinds of energy are shown in this picture?

• electrical energy

• heat energy

• light energy

• chemical energy

Multiple Choice

What kind of energy is created by eating food?

• mechanical energy

• sound energy

• electrical energy

• chemical energy

Energy changing forms

Energy can change from one form of energy to another. For example a man eats food this creates chemical energy. The man's body uses chemical energy to move his body changing into mechanical energy.