chapter
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## M

The input force is called the effort and the output force is called the load. If there is no friction:

energy transferred from effort = energy transferred to load

effort distance _ effort arm length load distance ~ load arm length

effort arm length load = effort x —:— --------- ;— ~n~load arm length

If friction is present, part of the effort is used against friction and the load is correspondingly smaller. It is usual to define three quantities: