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Principle of Superposition

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Question

Find out the frictional force between the 2 kg wooden block and the inclined plane as shown in above figure. $(s i n 30^{o} = 0.5, c o s 30^{o} = 0.58)$

A

2 N

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B

10 N

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C

12 N

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D

17 N

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E

20 N

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Solution

The correct option is A 10 N
Friction force acts in the upward direction and balances the component of weight along the inclined plane.
From figure, $f = 2 g$ $s i n 30^{o} = 2 \times 10 \times 0.5 = 10$ N

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