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A force of 11n is applied to the handle of a screw driver being used to pry off the lid of a paint can. what is the efficency of the screw driver.

Bethany Evans

in Physics

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Donald Ward on October 6, 2018

The efficiency of a machine = output energy / input energyfirst resolve the energy input = Fdwhere f is the force applied d is the distanceInput = 11 N ( 0.3 m) = 3.3 Joutput = 3 Jefficiency = 3 / 3.3 = 0.91 efficiency = 91 %


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