JEE MAIN - Physics (2003 - No. 35)
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
$$20N$$
$$50N$$
$$100N$$
$$2N$$
Explanation
Assume weight of the block = $$W$$ and friction force = $$f$$ = $$\mu N$$
For the block to remain stationary with the wall, weight of the block should balanced by the force of friction.
$$\therefore$$ $$f=W$$
$$ \Rightarrow $$ $$\mu N = W$$
$$ \Rightarrow $$ $$W$$ = 0.2 $$ \times $$ 10 = 2 N
For the block to remain stationary with the wall, weight of the block should balanced by the force of friction.
$$\therefore$$ $$f=W$$
$$ \Rightarrow $$ $$\mu N = W$$
$$ \Rightarrow $$ $$W$$ = 0.2 $$ \times $$ 10 = 2 N
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