Chapter 4 - Energy

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Chapter 4 - Energy

  1. 1. Chapter 4 <ul><li>Energy </li></ul>
  2. 2. Energy <ul><li>The ability to cause change </li></ul><ul><li>Anything that causes change must have energy </li></ul>
  3. 3. Different forms of energy <ul><li>Electrical </li></ul><ul><li>Chemical </li></ul><ul><li>Radiant </li></ul><ul><li>Thermal </li></ul>
  4. 4. Thermal Energy <ul><li>Energy from heat . </li></ul>
  5. 5. Electrical Energy <ul><li>A flow of electrons </li></ul>
  6. 6. Chemical Energy <ul><li>Energy stored in the chemical bonds of substances. </li></ul><ul><li>(food, gasoline) </li></ul>
  7. 7. Radiant Energy <ul><li>Energy from the sun. </li></ul>
  8. 8. Kinetic Energy Energy of motion or movement
  9. 9. Kinetic Energy Cont… <ul><li>Depends on the objects mass and speed </li></ul><ul><li>Measured in Joules (J) </li></ul><ul><li>Kinetic Energy Equation </li></ul><ul><li>KE = 1/2mv 2 </li></ul>
  10. 10. Potential Energy <ul><li>ELASTIC POTENTIAL ENERGY </li></ul><ul><li>Stored energy </li></ul><ul><li>Energy that is stored by something that stretches or compresses like a spring </li></ul>
  11. 11. Chemical Potential Energy <ul><li>Energy stored in chemical bonds. </li></ul><ul><li>(Ex: gasoline, food...) </li></ul><ul><li>In gasoline, the energy is released when the gas is burned </li></ul>
  12. 12. Gravitational Potential Energy <ul><li>Energy stored by objects due to their position above the surface of the Earth (GPE) </li></ul><ul><li>Depends on the mass and height of an object. </li></ul>
  13. 13. Gravitational Potential Energy Formula <ul><li>GPE = mgh </li></ul><ul><li>m = mass (kg) </li></ul><ul><li>g = acceleration of gravity, 9.8 m/s 2 </li></ul><ul><li>H = height of the object (m) </li></ul>
  14. 14. Mechanical Energy <ul><li>The total amount of kinetic and potential energy in a system </li></ul><ul><li>Formula for Mechanical Energy: </li></ul><ul><li>Mechanical energy = potential energy + kinetic energy </li></ul><ul><li>ME = PE + KE </li></ul>
  15. 15. Kinetic and Potential Energy <ul><li>In projectile motion, energy transforms between potential and kinetic. </li></ul>
  16. 16. The Law of Conservation of Energy <ul><li>Energy is not created or destroyed, but can change from one form to another. </li></ul>
  17. 17. Converting Mass into Energy <ul><li>Nuclear fusion: Two nuclei are fused together, transforming some of the mass into energy. </li></ul><ul><li>Takes place in the sun and other stars. </li></ul>
  18. 18. Converting Mass into Energy… <ul><li>Nuclear fission: An atom is split apart releasing some mass in the form of energy. </li></ul><ul><li>The total amount of energy is still conserved. </li></ul><ul><li>Energy in = Energy out. </li></ul>

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