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Question

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


A

Effort arm = 20 cm, Mechanical advantage = 1

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B

Effort arm = 20 cm, Mechanical advantage = 1.6

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C

Effort arm = 30 cm, Mechanical advantage = 1

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D

Effort arm = 100 cm, Mechanical advantage = 5

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Solution

The correct option is D

Effort arm = 100 cm, Mechanical advantage = 5


The crowbar is a class I lever as the fulcrum is situated in between the load and effort.

Here, load arm = 20 cm

Effort arm = 120 - 20 = 100 cm

So, MA=Effort armLoad arm=10020=5


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