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Power. Work has to do with a force causing a displacement . It has nothing to do with the amount of time that this force takes to cause the displacement. Consider a rock climber… he may ascend a few meters very slowly.

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  • Work has to do with a force causing a displacement.

  • It has nothing to do with the amount of time that this force takes to cause the displacement.




P = W/t slowly.

P- Power

W- Work

t- time


  • W= slowly.Fd (when force and displacement vectors are in the same direction)

  • P= W/t

  • P= Fd/t

  • d/t = v

    So………

    P =Fv


  • Unit of measurement for power: the slowly.Watt (W).

  • 1 Watt = 1 J/s = 1 kg m2/s3

  • Named after James Watt (b. 1736), an engineer whose improvements to the steam engine were very important to the Industrial Revolution.



  • You often see power measure in slowly.horsepower

  • 1 horsepower (hp) = 746 W

  • The term was adopted in the late 18th century by James Watt to compare the output of steam engines with the power of draft horses



Example
Example slowly.

  • A 70 kg jogger runs up a long flight of stairs in 4.0 s. The vertical height of the stairs is 4.5 m. Estimate the jogger’s power output in both watts and horsepower.


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