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# Work, Power, Mechanical Advantage, and Efficiency

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## Jenna Guzman

on 29 October 2012

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#### Transcript of Work, Power, Mechanical Advantage, and Efficiency

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Images from Shutterstock.com Work, Power, Mechanical Advantage, and Efficiency Power is the rate at which work is done. Mechanical Advantage is the ratio of the machine's output force to the input force applied. Work is the transfer of energy to an object by a force that makes an object move in the direction of the force. Work is only being done while the force is applied to the object. By Jenna Guzman 8M The efficiency of a machine is the ratio of the output work to the input work. For example, if a man pushes
a dresser with a force of
3 Newtons for 10 meters, to find
the work, do 3N x 10m. It would
equal 30 Joules of work. Work For example, if a man does
50 Joules of work in 10 seconds,
he produces 5 Watts of Power. P = W/t Power W = Fd MA = F(out) / F(in) Mechanical Advantage Work (in Joules) = force (in Newtons) x distance (in meters) Power (in Watts) = Work (in Joules) / time (in seconds) Mechanical Advantage (no units) = output force (in Newtons) / input force (in Newtons) Mechanical advantage can be less than 1, equal to 1, or greater than 1. A mechanical advantage greater than 1 means the output force is greater than the input force. Because output work is always less than input work, a machine's efficiency is always less than 100 percent. Efficiency (in %) = [output work (in Joules) / input work (in Joules)] x 100% Efficiency = [W(out) / W(in)] x 100% Efficiency credits go to The McGraw-Hill Physics Textbook. For example, a mechanic does 78.0 J of work pulling the rope on a pulley to lift a motor. The output work of the pulley is 64.0 J. The efficiency of the pulley would be 82.1%. Example:
A carpenter applies 525 N to the end of a crowbar. The force exerted on the board is 1,575 N. The mechanical advantage of the crowbar would be 3.
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