The ratio of load to effort of a machine _________ .

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Solution

Mechanical advantage is the ratio of the output force to the input force.
Mechanical advantage is a way of measuring how much easier it is to do work or how much less force is required.
$M e c h a n i c a l A d v a n t a g e = \frac{O u t p u t f o r c e}{I n p u t f o r c e}$ .
Mechanical advantage is unitless quantity.
Hence, the ratio of load to effort of a machine is mechanical advantage.

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