The ratio of the useful load force to the applied effort force. For an ideal simple machine in slow motion, the ratio of effort displacement to load displacement gives the same number by conservation of work.
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Mechanical advantage (MA) is a measure of the force amplification achieved by using a tool, machine, or mechanical system. It quantifies the relationship between the input force applied to a machine and the output force that the machine generates. Essentially, mechanical advantage allows a user to lift heavier loads or apply more force than they could with their own strength alone.