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Understanding Work and Power: Concepts, Calculations, and Examples

This section explores the concepts of work and power in physics, focusing on how work is defined as the transfer of energy through the movement of an object when a force is applied. It highlights the relationship between work and energy, detailing how work is calculated using the formula W = F × d, with relevant examples demonstrating these principles. Additionally, it explains power as the rate of performing work, including a formula to calculate power and an example involving the movement of a sofa.

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Understanding Work and Power: Concepts, Calculations, and Examples

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Presentation Transcript

  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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