Question

A cook uses the fire tongs of length $28cm$, to lift a piece of burning coal of mass $250g$. If he applies the effort at a distance of $14cm$ from the fulcrum, find the effort in S.I unit. Take $g=10m{s}^{-2}$.

Answer 1

Length of the tongs $L=28$

Length at effort apply, $l=14$

Moment of effort$=$Moment of applied force

$F\times 14=\frac{250}{1000}\times g\times 28$

$\Rightarrow F=0.25\times 10\times 2=5N$.