Question

A block and tackle system has 5 pulleys. If an effort of 1000 N is needed in the downward direction to raise a load of 4500 N, calculate :

(a) the mechanical advantage ,

(b) the velocity ratio, and

(c) the efficiency of the system.

Answer 1

a)Mechanical advantage (MA)= = 4.5
b)Velocity ratio (VR) = Number of pulley= 5
c)Efficiency = $\times$ 100 = $\times$ 100 = 90 %