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# A Block and Tackle System Has 5 Pulleys. If an Effort 0f 1000 N is Needed in the Downward Direction to Raise a Load of 4500 N, Calculate: (A) the Mechanical Advantage (B) the Velocity Ratio, - ICSE Class 10 - Physics

#### Question

A block and tackle system has 5 pulleys. If an effort 0f 1000 N is needed in the downward direction to raise a load of 4500 N, calculate:
(b) the velocity ratio, and
(c) the efficiency of the system

#### Solution

A block and tackle system has 5 pulleys. (n = 5)
Effort = 1000 N
(a) The mechanical advantage M.A = "𝑙𝑜𝑎𝑑"/"𝑒𝑓𝑓𝑜𝑟𝑡"= 4500/1000 = 4.5
(c) The efficiency of the system η = "𝑀.𝐴"/"𝑉.𝑅"= 4.5/5` = 0.9 𝑜𝑟 90%