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Work and Power

Work and Power. Chapter 5 Section 1. Work. Work – transfer of energy that occurs when a force makes an object move. Work. Work – transfer of energy that occurs when a force makes an object move For work to occur, an object must move.

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Work and Power

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  1. Work and Power Chapter 5 Section 1

  2. Work • Work – transfer of energy that occurs when a force makes an object move

  3. Work • Work – transfer of energy that occurs when a force makes an object move • For work to occur, an object must move. • The motion of the object must be in the same direction as the applied force on the object.

  4. Work and Energy • Work and energy are related!!! • When work is done, a transfer of energy must always occur.

  5. Work • Work is done on an object only when a force is being applied to the object and the object moves.

  6. Calculating Work • Work is equal to the force (in newtons) times the distance (in meters) • Work = Force x distance • W = Fd

  7. Example Problem: • You push a refrigerator with a force of 100 N. If you move the refrigerator a distance of 5 meters, how much work do you do?

  8. Example Problem: • You push a refrigerator with a force of 100 N. If you move the refrigerator a distance of 5 meters, how much work do you do? • Step 1  Identify known and unknown values • F = 100 N • d = 5 m • W = ???

  9. Example Problem: • You push a refrigerator with a force of 100 N. If you move the refrigerator a distance of 5 meters, how much work do you do? • Step 2  Solve the problem • W = Fd • W = (100 N) (5 m) • W = 500 J

  10. Power • Power – the amount of work done in a certain amount of time; rate at which work is done • Calculating power – power equals work divided by time • Power is measured in watts (W)

  11. Example Problem: • You do 900 Joules of work in pushing a sofa. If it took 5 seconds to move the sofa, what was your power?

  12. Example Problem: • You do 900 Joules of work in pushing a sofa. If it took 5 seconds to move the sofa, what was your power? • Step 1  Identify the known and unknown values • W = 900 J • t = 5 s • P = ???

  13. Example Problem: • You do 900 Joules of work in pushing a sofa. If it took 5 seconds to move the sofa, what was your power? • Step 2  Solve the problem • P = __W__ = __900 J__ = 180 Wt 5 s

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