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# Work, Energy and Power 2

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### Transcript

• 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