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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.


Solution

a)Mechanical advantage (MA)= fraction numerator L o a d over denominator E f f o r t end fraction equals 4500 over 1000= 4.5
b)Velocity ratio (VR) = Number of pulley= 5
c)Efficiency = fraction numerator M A over denominator V R end fraction × 100 =fraction numerator 4.5 over denominator 5 end fraction × 100 = 90 %


Physics
Concise Physics
Standard X

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