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Work & Power

Work, Mechanical Advantage, Power & Efficiency
by

Lorena Longoria

on 29 October 2012

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Transcript of Work & Power

Work & Power Lorena Longoria 8H Work Mechanical Advantage Power the end ! Efficiency Work is the transfer of energy that occurs when a force makes an object move. Mechanical advantage is the number of times a machine multiplies the effort force. Power is the rate at which work is done. Efficiency is a measure of how much work is changed to useful work An object must move for work to be done. To calculate work, multiply force and distance.
W=FD Work is related to energy. Work is always measured in Joules. It allows machines to to more work with less effort To find the mechanical advantage, divide the resistance force by the effort force. MA= Resistance force/effort force It is the source of energy used to operate a machine. To increase power, work must be done in less time. To find power, you can divide work by time.
P=W/T Efficiency will always be less than 100%. Lubricants can make a machine more efficient by reducing friction. To calculate efficiency, divide work output by work input and multiply by 100. E=(Work Output/Work input) x 100 Power is always measured in Watts.
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