1 energy and work

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1 energy and work

  1. 1. Energy and Work
  2. 2. <ul><li>Energy - the ability to cause a change. </li></ul><ul><li>Ex: Baseball hitting a window. The baseball has energy because it caused the change. </li></ul><ul><ul><li>Different forms of energy- radiant, electrical, chemical, thermal and nuclear. </li></ul></ul>
  3. 3. <ul><li>Kinetic energy (KE)- the energy in the form of motion. </li></ul><ul><li>Ex: anything moving </li></ul><ul><li>The amount of kinetic energy on an object depends on </li></ul><ul><li>(1.)mass (more mass = more KE) </li></ul><ul><li>(2.)velocity (more velocity = more KE) </li></ul>
  4. 4. <ul><li>Potential energy (PE)- stored energy. </li></ul><ul><li>The amount of potential energy depends on its position. The greater position = more PE. </li></ul><ul><li>Ex: Flowerpot on windowsill. The higher the windowsill, the greater PE so greater KE. </li></ul>
  5. 5. <ul><li>Mechanical energy- the total amount of kinetic and potential energy in a system. </li></ul><ul><li>Ex: Roller coasters. At the top of hills, they have high PE and low KE. When they go downhill, then they have low PE and high KE. </li></ul>
  6. 6. <ul><li>Law of conservation of energy- Energy can’t be created nor destroyed (under ordinary conditions)…..energy just changes forms. </li></ul><ul><li>Ex: KE is not created…it is changed from PE. </li></ul>
  7. 7. <ul><li>Work- a transfer of energy through motion. </li></ul><ul><li>-When force acts over a distance in the direction of an object’s motion, work is done. </li></ul>
  8. 8. <ul><li>2 things to see if work is done. </li></ul><ul><li>1.Movement </li></ul><ul><li>2.Motion in same direction as the force. </li></ul>
  9. 9. <ul><li>Work equation </li></ul><ul><li>Variable Ending Units </li></ul><ul><li>W = Work Joules (J) </li></ul><ul><li>F = Force Newtons (N) </li></ul><ul><li>d = distance meter (m) </li></ul>
  10. 10. <ul><li>Work Equation </li></ul><ul><li>W = F x d </li></ul><ul><li>F = W / d </li></ul><ul><li>d = W / F </li></ul>W F d X . . . .

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