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Power

A block of ma...

Question

A block of mass 3 kg is placed on a rough horizontal surface $(μ_{s} = 0.4)$ . A force of 8.7 N is applied on the block. If $g = 10 m s^{- 2}$ , then the force of friction between the block and floor is:

A

8.7 N

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B

12 N

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C

10 N

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D

zero

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Solution

The correct option is A 8.7 N
$f_{m a n} = μ N = 0.4 \times 30 = 12 f_{m a n} > f_{a v f} S o, f = f_{a p p l y} f = 8.7 N$

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