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Question

(D) For the block to be held stationary against the wall,the downward gravitational force (weight $W$) must be balanced by the upward frictional force

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$2$

Vedclass · Answer

(D) For the block to be held stationary against the wall,the downward gravitational force (weight $W$) must be balanced by the upward frictional force $(f)$.The normal force $(N)$ exerted by the wall on the block is equal to the applied horizontal force,so $N = 10\,N$.The maximum static frictional force is given by $f = \mu N$,where $\mu = 0.2$ is the coefficient of friction.Thus,$f = 0.2 	imes 10\,N = 2\,N$.Since the block is stationary,$W = f = 2\,N$.

$A$ horizontal force of $10\,N$ is necessary to just hold a block stationary against a wall. The coefficient of friction between the block and wall is $0.2$. The weight of the block is ........ $N$.

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