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Calculating Friction Using Coeffcients

A block of ma...

Question

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

A

2.5 N

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B

0.98 N

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C

4.9 N

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D

0.49 N

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Solution

The correct option is B
0.98 N

Since the block is stationary, friction balances the weight of the block.
Hence, f = mg = 0.1 $\times$ 9.8 = 0.98 N

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