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A crowbar of length 120 cm has its fulcrum situated at a distance of 20 cm from the load. Calculate the mechanical advantage of the crowbar.

Machines

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Answer

Given,

Total length of a crowbar = 120 cm

Effort arm = 120 – 20 = 100 cm

Load arm = 20 cm

We know that,

Mechanical advantage M.A.=Effort armLoad armM.A.=10020M.A.=5\text{Mechanical advantage M.A.} = \dfrac{\text{Effort arm}}{\text{Load arm}} \\[0.5em] M.A. = \dfrac{100}{20} \\[0.5em] \Rightarrow M.A. = 5 \\[0.5em]

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