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Physics

A crowbar of length 1.0 m has its fulcrum at a distance of 0.2 m from the load. The mechanical advantage of the crowbar is:

  1. 5
  2. 4
  3. 3
  4. 2

Machines

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Answer

4

Reason —

Given,

  • Total length of crowbar = 1.0 m
  • Fulcrum distance from the load = Load arm = 0.2 m

Crowbar is a class I lever shown below :

A crowbar of length 1.0 m has its fulcrum at a distance of 0.2 m from the load. The mechanical advantage of the crowbar is: ICSE 2025 Improvement Physics Solved Question Paper.

Now,

Effort arm = Total length of crowbar - Load arm = 1.0 - 0.2 = 0.8 m

As,

Mechanical Advantage (MA)=Effort armLoad arm\text {Mechanical Advantage (MA)} = \dfrac {\text {Effort arm}}{\text {Load arm}}

=0.80.2= \dfrac{0.8}{0.2} = 4

So, mechanical advantage of the crowbar is 4.

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