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Work, Energy and Power 2


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Work, Energy and Power 2

  1. 1. Work, Energy and Power Conservation of Energy & Work Done
  2. 2. Objectives <ul><li>Apply the principle of the conservation of energy to new situations or to solve related problems </li></ul><ul><li>Apply the relationships for kinetic energy and potential energy to new situations or to solve related problems </li></ul><ul><li>Recall and apply the relationship work done = magnitude of a force x the distance moved in the direction of the force </li></ul><ul><li>Understand the relation between work done and energy change </li></ul><ul><li>Recall and apply the relationship power = work done/time taken to new situations or to solve related problems </li></ul>
  3. 3. Conservation of Energy - Trebuchet <ul><li>Where does the potential energy in the lever arm come from? </li></ul><ul><li>What are the energy changes that take place throughout the loading, cocking, and releasing of the trebuchet? </li></ul><ul><li>What evidence is there that energy is conserved? </li></ul>
  4. 4. Conservation of Energy – Simple Pendulum Why was the pendulum unable to hit the face? What are the energy changes? Video
  5. 5. Conservation of Energy – Example 2 0.800 m 0.900 m 1.000 m
  6. 6. Work Done <ul><li>Work is said to be done when a force produces a displacement of an object. </li></ul><ul><li>Scalar Quantity </li></ul><ul><li>Work Done = Force x Distance moved in direction of force </li></ul><ul><li>Unit: Joule(J) or Newton Metre (Nm) </li></ul>
  7. 7. Power <ul><li>Rate of doing work </li></ul><ul><li>P = W/t or ∆E/t </li></ul><ul><li>Unit: Watts (w) or Joule per second (J/s) </li></ul>
  8. 8. Efficiency – Hydroelectic Plant Video
  9. 9. Efficiency