Potential energy is stored energy that an object has due to its position or chemical composition, while kinetic energy is the energy of motion. A roller coaster car has kinetic energy as it moves down the track, and potential energy as it slows to a stop at the top of a hill where it is positioned to move downward. Substances like wood, coal, oil and gasoline have potential chemical energy that can be released as heat energy through burning. Potential energy can be converted to kinetic energy and vice versa.

1. Energy What are potential and kinetic energy?

2. First some review… Write down the definition of energy. Write down the four of the seven types of energy and an example of each.

3. Energy… … is the ability to make things move

4. The seven types of energy… Chemical - gasoline, Light – flash light, Heat – burner on a stove, Nuclear - sun, Mechanical - car, Sound – music on the radio, Electrical - lightning

5. Definitions Kinetic Energy : the energy of motion Potential Energy : stored energy

6. A Roller Coaster A roller coaster speeds along its track. It has kinetic energy because it is moving .

8. A Roller Coaster As it slows to a stop at the top of a hill, it has potential energy because of where it is. It has the potential to move because it is above the ground and has somewhere to go.

10. What type of energy is this? (Remember the seven types?)

12. Right, mechanical. What if the cars crashed and burned? What type would it be?

14. Right, heat.

16. Substances like wood, coal, oil, and gasoline have stored energy because of their chemistry – they can burn Stored energy is potential energy

17. Potential Energy can be changed into Kinetic Energy Also Kinetic Energy can be changed into Potential Energy