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d) A fire tong has its arms 20cm long. It is used to lift a coal of weight 1.5kgf by applying aeffort at a distance of 15cm from the fulcrum. Find the mechanical advantage and effortneeded.

Answer»

Mechanical advantage is = distance of force from fulcrum / distance of load from fulcrum

= 15 cm / (20 - 15) cm = 3

Weight of coal / Force or effort needed = 3 = mech. adv.

So effort needed = weight of coal / 3 = 1.5 kgf /3 = 0.5kgf



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