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Work, Energy and Power 2
Work, Energy and Power 2
Work, Energy and Power 2
Work, Energy and Power 2
Work, Energy and Power 2
Work, Energy and Power 2
Work, Energy and Power 2
Work, Energy and Power 2
Work, Energy and Power 2
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Work, Energy and Power 2

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

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