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Net Contact Force

A horizontal ...

Question

A horizontal force of 10 N 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

A

20 N

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B

50 N

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C

100 N

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D

2 N

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Solution

The correct option is D 2 N
$\begin{matrix} H o r i z o n t a l f o r c e o n b o d y = N o r n a l r e a c t i o n f o r c e N = 10 N max i m u m f r i c t i o n f = μ N = M g t h u s, M g = 0.2 \times 10 = 2 N H e n c e, t h e o p t i o n D i s t h e c o r r e c t a n s w e r . \end{matrix}$

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