Physics - W.E.P. Question with Solution | TestHub
Of course you all know about pulleys, but have you really thought about utility of a pulley. The most important use of a pulley lies in the fact that a pulley not only can change direction of your effort (force), but can also make you lift a bigger weight with a smaller force. Let us consider figure 1 & 2. In both cases we have to just lift the block of mass M.
It is obvious that in case (2), will be half of in case (1) if we neglect mass of pulley and rope. This ability of pulley to lift greater weight by applying smaller force can be measured by quantity called Mechanical Advantage:
So M.A. in figure (1) is 1 and in figure (2) is 2.
A pulley system has M.A. = 3. If load moves up by 2cm, then distance moved by point at which effort force is applied is :
Options:
Answer:
Solution:
Work conservation: the effort point moves M.A. times the load's displacement:
Ans. (A)
