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Coefficients of Friction

A block of ma...

Question

A block of mass $5$ kg is lying on a rough horizontal surface. The coefficient of static and kinetic friction are $0.3$ and $0.1$ and $g = 10 m s^{- 2}$ . The frictional force on the block is?

A

25

N

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B

15

N

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C

10

N

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D

Zero

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Solution

The correct option is B Zero
The frictional force acting on the block is 0.
Frictional force acts only when a net external force acts on the object. And the frictional force acts in the opposite direction of external force preventing the impending motion.

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