Question

A duster weighting $0.5kg$ is pressed against a vertical wall with a force of $11N$. If the coefficient of friction is $0.5$. Check whether the work done in rubbing it upward by distance of $10cm$ is less or greater than $0.55J$

Answer 1

$fs=\left(11\right)\left(\mu \right)$ [Ref. image]

as $N=11$

$\therefore fs=\left(11\right)\left(0.5\right)$

$=5.5$ Newtons

Work done $=Mg\left(0.1\right)+fs\left(0.1\right)$

So, it is greater than 0.55