Question

hello brainliacs!❤
Please answer this question--
A Fire tong has its arm 20 cm long. It's used to lift a coal of weight 1. 5 kgf by applying an effort at a distance of 15 cm from the fulcrum. Find the mechanical advantage of the fire tongs and the effort needed.
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Answer 1

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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