Question

what is the use of law of machine​

Answer 1

Machines which are used to lift a load are governed by the "Law of machines", which states that the effort to be applied on the machine (p) is related to the weight (w) which it can lift as - p = mw + c Where m and c are positive constants which are characteristics of the machine.

Answer 2

The use of aw of machine is as follows:

"The 'Law of Machines' governs machines that hoist a load, which states that the effort to be exerted to the machine (p) is related to the weight (w) that it can lift as p = mw + c, where m and c are positive constants that represent machine features".