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Question

# A block of mass 0.1 kg is held against a wall by applying a horizontal force of 5N on the block. If the co-efficient of friction between the block and the wall is 0.5, the magnitude of 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 NStatic friction force acts in response to a force trying to cause a stationary object to start moving. If there is no such force acting on an object, the static friction force is zero. If there is a force trying to cause motion, the static friction force will increase up to a maximum value before it is overcome and motion starts.fstatic ≤ μstatic × Fnormalvalue of static friction varies from zero to maximum values of force when it just starts moving.fs≤μNhere normal reaction force is 5Nthenfs≤0.5×5fs≤2.5Nbut weight force is F=mg=0.1×9.8F=0.98N(downward)thus friction force is only 0.98 N Option B is correct

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