Draw diagram of a single fixed pulley and obtain expressions for its:

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asked Dec 7, 2018 in Class X Science by aditya23 (-588 points)

Draw diagram of a single fixed pulley and obtain expressions for its:
(i) Mechanical advantage, 

(ii) Velocity ratio, and 

(iii) Efficiency, in the ideal case.

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1 Answer

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answered Dec 7, 2018 by muskan15 (-2,322 points)

The diagram of a single fixed pulley is shown alongside. If T is the tension in each strand of the string and in the ideal case string is massless and there is no friction in the pulley bearings, then in equilibrium, E = T and L = T

(i) Mechanical advantage = L/E = T/T = 1

(ii) If the effort E moves a distance d downwards, the load L moves the same distance d upwards.

So, velocity ratio = dE/dL = d/d = 1

(iii) Efficiency = M.A./V.R. = 1/1 = 1(or 100%).

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