Question

A 600 N load was raised by an effort of 200 N by using a lever. If the load was 20 cm from the fulcrum and effort was applied 80 cm for from fulcrum. Calculate mechanical advantage, velocity ratio and efficiency of machine.
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Answer 1

Answer:

a) A machine is a device by which we can either overcome a large resistive force at some point by applying a small force at a convenient point and in a desired direction or by which we can obtain a gain in the speed.

(b) An ideal machine is a machine whose parts are weightless and frictionless so that which there is no dissipation of energy in any manner. Its efficiency is 100%, i.e. the work output is equal to work input.