The mechanical advantage of a machine which is used to raise a load of 30 kgf is 4. What is the effort needed to raise the load?

10 kgf

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8 kgf

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4 kgf

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7.5 kgf

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Solution

The correct option is D 7.5 kgf
Given mechanical advantage of a machine = 4
Load = 30 kgf

Mechanical advantage $= l o a d e f f o r t$
$4 = \frac{30}{e f f o r t}$
effort $= \frac{30}{4} = 7.5 kgf$

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