Physics
The mechanical advantage of an actual pulley is less than 1. Give a reason. What is the justification for using the pulley then?
Machines
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Answer
The mechanical advantage of an actual pulley is less than 1 due to friction present in pulley. The reason why we use the pulley when its mechanical advantage is equal to 1 or less than 1 is that the pulley allows us to apply the effort downwards i.e., in a convenient direction to raise the load.
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