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Energy

Learn about energy and its two main forms: kinetic energy, which is the energy of motion, and potential energy, which is stored energy. Discover examples and equations for calculating both types of energy. Explore the law of conservation of energy.

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Energy

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  1. Energy Ability to do work or cause change SI Unit : Joule

  2. Work – measure of energy that is transferred from one system to another. - occurs when a force causes an object to move

  3. Two types of Energy: Kinetic Energy Potential Energy

  4. Kinetic Energy (K.E.)- energy of motion - depends on mass and speed

  5. Examples of Kinetic Energy Person running Car moving Football being thrown

  6. Kinetic Energy equation KE = ½ mv2 KE = ½ mass x velocity2 Units: kg(m/s)2 or Joule (J)

  7. Potential Energy- Energy that is stored and held in readiness

  8. Examples of Potential Energy

  9. 4 types of potential energy 1. Elastic P.E. Gravitation P.E. Chemical P. E. Electrical P.E.

  10. Elastic P.E - Stored energy in something compressed or stretched.

  11. Example of Elastic PE

  12. Gravitational P.E. - Energy due to height in a gravitational field GPE = 9.8 m/s2 x mass x height GPE = 9.8mh

  13. Example of Gravitational PE

  14. Chemical Potential Energy Energy stored in chemical bonds Examples: food, gasoline

  15. Electrical Potential Energy energy due to separation of charges

  16. Calculating Potential Energy PE = (mass)(gravitational field strength)(height) or PE = m g h g = 9.8 N/kg Units: N/m or Joule (J)

  17. Law of Conservation of Energy • Energy cannot be created or destroyed • Energy can change from one form to another, but the total amount of energy always remains the same

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