Question

# A fire tongs has arms $$20 \,cm$$ long. Its is used to lift a coal of weight $$1.5 \,kgf$$ by applying an effort at a distance $$15 \,cm$$ from the fulcrum. Find : (i) the mechanical advantage of fire tongs and (ii) the effort needed.

Solution

## Fire tongs has its arms $$= 20 \,cm$$Effort arm $$= 15 \,cm$$Load arm $$= 20 \,cm$$(i) Mechanical advantage M.A. $$= \dfrac{Effort \,arm}{Load \,arm} = \dfrac{15}{20} = 0.75$$(ii) $$Effort = \dfrac{Load}{M.A.} = \dfrac{1.5}{0.75} = 2.0 \,kgf$$Physics

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