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Question

A fire tongs has its arms $$20cm$$ long. It is used to lift a coal of weight $$1.5kgf$$ by applying an effort at a distance $$15cm$$ from the fulcrum. Find the mechanical advantage of fire tongs.


A
3
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B
0.50
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C
0.90
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D
0.65
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Solution

The correct option is A $$3$$
Effort Arm $$ = 15 cm$$
Load Arm $$ = 20 - 15 = 5 cm$$
Mechanical Advantage $$= \dfrac{\text{Effort Arm}}{\text{Load Arm}} = \dfrac{15}{5} = 3$$

Physics

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