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Q.

A block of mass 0.1kg is held against a wall applying a horizontal force of 5N on the block. If the coefficient of friction between the block and the wall is 0.5. the magnitude of the friction force acting on the block is

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a

0.98N

b

0.49N

c

2.5N

d

4.9N

answer is B.

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Detailed Solution

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Since downward force is less than limiting friction therefore block is at rest so the static force of friction will Work on it. Use the formula: f = mg (frictional force balances the weight) f = 0.1 x 9.8 = 0.98

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