The mechanical advantage of an ideal single movable pulley is 1 (b) 2 (c) less than 2 (d) less than 1?
The mechanical advantage of an ideal single movable pulley is 2.
Derivation: Consider the diagram given below:
Here the load L is balance by the tension in two segments of the string and the effort E balances the tension T at the free end, so
L = T + T = 2T and E = T
Assumption: Weight of the pulley is negligible.
We know that,
M.A =`"𝐿𝑜𝑎𝑑 (𝐿)"/"𝐸𝑓𝑓𝑜𝑟𝑡 (𝐸)"`= `"2𝑇"/"𝑇"`=2
Thus, a single movable pulley has a M.A. equal to 2.