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

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Given:-

A block and tackle system has 5 pulleys. (n = 5)

Effort = 1000 N

Load = 4500 N

Answer:-

_______________

(a)

The mechanical advantage (M.A) =

=> (load/effort)

=> 4500/1000 = 4.5

_______________

(b)

The velocity ratio = n = 5

_______________

(c)

The efficiency of the system (η) =

=> (M.A/V.R)

=> 4.5/5 = 0.9

_______________

Hence, Done.