30seconds with RopeLab: #18 IMA, TMA, AMA.

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30seconds with RopeLab: #18 IMA, TMA, AMA. Ideal - no loss, Theoretical - apply theory, Actual - measured.
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But to know the efficiency of the pulley, one must test it with a load cell first right? The efficiency is the ratio between the output force and input force. So whats the difference between theoretical mechanical advantage and actual mechanical advantage?

jefgir