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 =...

## See

This Answer NowStart your **48-hour free trial** to unlock this answer and thousands more. Enjoy eNotes ad-free and cancel anytime.

Already a member? Log in here.

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 %

**Further Reading**