The Nature of Energy.

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Presentation transcript:

The Nature of Energy

1. Energy - The ability to cause change When something is able to change its environment or itself, it has energy. Examples of energy forms: electrical, chemical, and thermal (sun).

2. Kinetic Energy- Energy in the form of motion Amount depends upon the mass of the moving object and its velocity 2 Kinetic energy = ½(mass)x(velocity)

3. Joule - SI unit for energy – “J” Named after 19th Century British scientist James Prescott Joule

4. Potential Energy - Stored energy Motionless objects can have energy Types of Potential Energy: elastic, chemical, gravitational

5. Elastic Potential Energy - Energy stored by something that can stretch or compress Examples: rubber band, spring, hair twisty

6. Chemical Potential Energy - Energy stored in the chemical bonds between atoms Examples: natural gas, food stored in your body

7.Gravitational Potential Energy- Energy stored by objects that are above the Earth’s surface Anything that can fall has GPE Dependent upon the mass of the object, the acceleration due to gravity, and the height above the ground GPE(J) = mass x 9.8m/s2 x height