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 : (i) the mechanical advantage, (ii) the velocity
ratio, and (iii) the efficiency.
Ans. (i) 3, (ii) 3, (iii) 100%​

Answer 1

Given,

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

To find,

(i) mechanical advantage.

(ii) the velocity ratio.

(iii) the efficiency.

mechanical advantage is the ratio of the load (output) to the effort (input).

i.e., Mechanical Advantage = 75kgf/25kgf = 3

The velocity ratio = number of pulleys = 3

The efficiency = (Mechanical Advantage)/(velocity ratio) × 100

= 3/3 × 100 = 100%

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