In a block and tackle system consisting of 3 pulleys, a load of 75 kgf is raised with an effort of 25 kgf. Find : (i) the mechanical advantage, (ii) the velocity ratio, and (iii) the efficiency.

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Solution

1)Mechanical advantage (MA)= $fraction numerator L o a d over denominator E f f o r t end fraction equals 75 over 25$ = 3
2)Velocity ratio (VR) = Number of pulley= 3

3)Efficiency = $fraction numerator M A over denominator V R end fraction$ $\times$ 100 = $\times$ 100 = 100 %

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