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  4. 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 the wall is 0.2. The weight of the block is :-

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Q. 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 the wall is $0.2$. The weight of the block is :-Physics Question Image

Solution:

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$N =10$ (In horizontal direction)
$\Rightarrow f = mg (\text { but } f =\mu N )$
$\Rightarrow \mu N = mg $
$\Rightarrow (0.2)(10)= mg $
$\Rightarrow mg =2\, N$