Ppt Energy

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Ppt Energy

  1. 1. ENERGY
  2. 2. Energy <ul><li>Everything in the universe can be classified as either matter or energy. </li></ul><ul><li>Matter is anything that has mass and takes up space. </li></ul><ul><li>Energy is everything else like…… </li></ul>
  3. 3. Energy <ul><li>Kinetic energy </li></ul><ul><li>Potential energy </li></ul><ul><li>Electricity </li></ul><ul><li>Nuclear energy </li></ul><ul><li>Light </li></ul><ul><li>Sound </li></ul><ul><li>Chemical </li></ul><ul><li>Thermal (heat) </li></ul>
  4. 4. Energy <ul><li>Energy is… </li></ul><ul><ul><li>The ability to cause change </li></ul></ul><ul><ul><li>The ability to do work. </li></ul></ul>
  5. 5. Energy <ul><li>The unit for energy is the joule. </li></ul><ul><li>1 joule = 1 kg- m 2 /s 2 </li></ul>
  6. 6. Kinetic Energy <ul><li>Kinetic energy (KE) is energy in the form of motion. </li></ul><ul><li>The amount of kinetic energy an object has depends on its ___________ and _________ . </li></ul><ul><li>KE = ½ mv 2 </li></ul>
  7. 7. Kinetic Energy <ul><li>Which has more kinetic energy? </li></ul><ul><ul><li>A bus traveling at 65 mph </li></ul></ul><ul><ul><li>A car traveling at 65 mph </li></ul></ul><ul><li>Which has more kinetic energy? </li></ul><ul><ul><li>A bus traveling at 65 mph </li></ul></ul><ul><ul><li>A bus traveling at 40 mph </li></ul></ul>
  8. 8. Potential Energy <ul><li>Potential energy is ___________ energy. </li></ul><ul><li>The amount of potential energy depends on its ____________ or ___________. </li></ul><ul><li>Potential energy due to the object’s height above the earth’s surface is called ______________ . </li></ul>
  9. 9. Gravitational Potential Energy <ul><li>The formula for gravitational potential energy is… </li></ul><ul><li>GPE = mgh </li></ul>
  10. 10. Gravitational Potential Energy <ul><li>Which has more GPE? </li></ul><ul><ul><li>A boy sitting in a tree 12’ above the ground </li></ul></ul><ul><ul><li>A squirrel sitting in a tree 12’ above the ground. </li></ul></ul><ul><li>Which has more GPE? </li></ul><ul><ul><li>A squirrel sitting 12’ above the ground </li></ul></ul><ul><ul><li>A squirrel sitting 30’ above the ground. </li></ul></ul>
  11. 11. The Law of Conservation of Energy <ul><li>Energy cannot be created or destroyed only transformed from one form into another. </li></ul>
  12. 12. WORK <ul><li>The scientific definition of work is …. </li></ul><ul><li>Work, like energy, is measured in ________ </li></ul><ul><li>The formula for work is… </li></ul><ul><li>W = F x D </li></ul>
  13. 13. WORK <ul><li>Two factors must be considered when deciding if work is being done </li></ul><ul><li>Does the object move? </li></ul><ul><li>What is the actual force applied? </li></ul>
  14. 14. He may expend energy when he pushes on the wall, but if it doesn’t move, NO WORK is performed on the wall!!!
  15. 15. WORK <ul><li>In which case, would more work be done? </li></ul><ul><li>Lifting 1 book over your head or lifting 2 books over your head. </li></ul><ul><li>Holding 2 books at shoulder level or lifting 2 books over your head. </li></ul><ul><li>Holding a stack of books and walking them to the table or pushing a stack of books over the table. </li></ul>

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