# A machine applies a force of 100 Newtons over a distance of 10 meters to raise a 500 newton drum 1.5 meters. What is the work input?

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### 1 Answer

The work input is the total work done by the machine not the effective work.

The effective work done by a machine is the output work.

The ratio between work output and work input gives you the efficiency of the machine.

Therefore the work input here is,

Work input = Input Force x distance

= 100 x 10 Nm

= 1000 J

Work output = 500 x 1.5 Nm

= 750 J

Efficiency = 750/1000 x 100%

= 75 %

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