Question

In a block and tackle system consisting of 3 pulleys, a load of 75 kgf is raised with an effort of 25 kgf, find the mechanical advantage.

Answer 1

Given:
The block and tackle system consists of 3
pulleys, i.e. $n=3$
Effort $E=25kgf=250N$
Load $L=75kgf=750N$
Mechanical advantage $M.A.=\frac{load\left(L\right)}{effort\left(E\right)}$
$=\frac{750N}{250N}$
$=3$
Or
The mechanical advantage is equal to the number of pulleys in both the blocks.
Mechanical advantage $M.A.=n=3$