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Unformatted text preview: and energy have units of Joules. The theorem can then be restated succinctly W net = K WORKENERGY THEOREM Absent from the analysis up to this point is the time it takes for the force to do this work. The force delivers work but it takes time to deliver the work. We say the faster the force delivers the work the more powerful the force. That is, if a force delivers an amount of work, W, in a time interval, t, we define the (average) power of this force as P ave W/ t . Taking the limit as t 0 converts the average to the instantaneous power, P dW/dt . Using dW F dr gives another way of finding P, P = F v , where the dot product appears once again. The units for power are Watts (1Watt 1Joule/1second). Examples[in class]...
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 Spring '08
 Chen
 Physics, Energy, Force, Kinetic Energy, Mass, Power, Work

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