Pulley system has a velocity ratio 3 and an efficiency of 80%. Calculate the mechanical advantage of the system and the value of the effort required to lift a load of 100 N.

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Solution

$e f f i c i e n c y = \frac{m e c h a n i c a l a d v a n t a g e}{v e l o c i t y r a t i o} \frac{80}{100} = \frac{m . a}{3} 0.8 \times 3 = m . a = 2.4 . a n d m . a = \frac{l o a d}{e f f o r t} = \frac{l}{e} 2.4 = \frac{100}{e} e = \frac{100}{2.4} 41.66 N E W T O N$

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