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
B
0.50
C
0.90
D
0.65

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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