HL Physics - Work, Energy, and Power

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10 Terms

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Work

when a force acting an object transfers energy to it

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Area on a force-displacement graph…

equal to work done

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For constant velocity, KE is proportional to …

mass

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For constant mass, KE is proportional to …

the square of velocity

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Conservation of Energy

energy cannot be created or destroyed, only transferred

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Sankey Diagram

diagram that represents energy transfers (shows useful and useless output)

<p>diagram that represents energy transfers (shows useful and useless output)</p>
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Power

rate of work done or the rate of energy transfer

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Efficiency

the ratio of useful energy output to energy input (unitless quantity)

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Work Done in a Stretched Spring

E(p) = ½ k x²

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Power Formulas

  • P = Fs(cosθ) / t

  • P = W / t

  • P = F v