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Energy Energy - the ability to do work.

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Presentation on theme: "Energy Energy - the ability to do work."— Presentation transcript:

1 Energy Energy - the ability to do work.
A river can move a boat, a car can move people, they must have energy.

2 First State of Energy Potential Energy – Stored energy because of an objects position or chemical makeup.

3 Potential Energy Gravitational Potential Energy - A rock on a cliff has potential energy GPE = weight x height above ground Chemical Potential Energy –Food, Coal, Gasoline Elastic Potential Energy - Spring

4 Second State of Energy Kinetic Energy – energy an object has because it is moving. KE = 1/2 x mass x velocity2 Also heat from burning.

5 Kinetic Energy A ball falling has kinetic energy.
Gasoline exploding is kinetic energy. The faster it moves, the more kinetic energy.

6 Potential and Kinetic Potential energy may become kinetic energy.
Water behind a dam has a lot of potential energy. Releasing the water and letting it flow changes the energy to kinetic.

7 P.E. and K.E. Cont’d Kinetic energy may also become potential energy.
Throwing a ball straight up into the air – Its kinetic energy of motion is changed into potential energy. The higher an object goes the more potential energy it has.

8 P.E. to K.E.

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