(a) 1
(b) 2
(c) less than 2
(d) less than 1.
Solutions:
The correct option is (b) 2. Mechanical advantage of an ideal single movable pulley is 2 derivation of which is given below:
According to given figure, the load L is balanced by the tension (T) in two segments of the string. And the effort E is balancing the tension T at the free end, therefore –
Load = 2T
And, Effort = T
Here, we are assuming that the weight of the pulley is negligible
Expression of the mechanical advantage is as follows –
M.A. = Load L / Effort E = 2T / T
M.A. = 2
Therefore, a single movable pulley has an M.A equal to 2.