Question

A lever of length 1m has been used to lift a load of 600N by applying an effort of 200N. If load is at 20cm from fulcrum, calculate mechanical advantage, velocity ratio and efficiency. (Ans: MA = 3, VR = 4, n=75%)


please help me to solve it​

Answer 1

(a) a machine is a device 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 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. it's efficiency is 100% i. e. work output is equal to work input