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: Determined by measuring the actual forces acting on a machine; it includes the effects of friction. Ideal Mechanical Advantage (IMA) : The mechanical advantage in the absence of friction. Efficiency : The percentage of work input that becomes work output. Efficiency Work Output Work Input
If a machine has an output force of 100 N and an input force of 20 N, what is its MA?
Key Concept: Because friction is ignored, IMA is a theoretical maximum. Actual Mechanical Advantage (AMA)
( AMA = \fracF_\textoutF_\textin = \frac400 , \textN20 , \textN = \mathbf20 )
Leo flipped open the manual to a dog-eared page. "Look, here’s the answer key for the standard setup. It says right here: Section 14.3 Mechanical Advantage and Efficiency Answer Key . It lists the output force as 800 N and the input force as 200 N. So, the mechanical advantage is 4. Boom. We’re done."
