(b) State the principle of an ideal machine.

Solutions:

(a) A machine is a mechanism that allows us to overcome a big resistive force (or load) at a specific place by applying a modest force (or effort) in a suitable location and in the desired direction, or gain speed.
(b) An perfect machine is one in which all of the parts are weightless and frictionless, and there is no energy dissipation in any way. Its efficiency is 100 percent since the work output equals the work input.