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# Kinetic Energy

## Objects in motion possesses energy which depends on their speed and mass.

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Energy Unit: Kinetic Energy

What could these four photos possibly have in common? Can you guess what it is? All of them show things that have kinetic energy.

### Defining Kinetic Energy

Kinetic energy is the energy of moving matter. Anything that is moving has kinetic energy—from atoms in matter to stars in outer space. Things with kinetic energy can do work. For example, the spinning saw blade in the photo above is doing the work of cutting through a piece of metal. You can see a cartoon introduction to kinetic energy and how it is related to work at this URL: http://www.youtube.com/watch?v=zhX01toLjZs

### Summary

• Kinetic energy (KE) is the energy of moving matter. Anything that is moving has kinetic energy.
• The amount of kinetic energy in a moving object depends directly on its mass and velocity

### Vocabulary

• kinetic energy: Energy of moving matter.

### Practice

At the following URL, review kinetic energy and how to calculate it. Then take the quiz at the bottom of the Web page. Be sure to check your answer. http://www.physicsclassroom.com/class/energy/u5l1c.cfm

### Review

1. What is kinetic energy?
2. The kinetic energy of a moving object depends on its mass and its
1. volume.
2. velocity.
3. distance.
4. acceleration.

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