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Question

# A block of mass 10 kg is pulled at constant speed on a rough horizontal surface by a force of 19.6 N. The coefficient of friction is

A
0.1
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B
0.2
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C
0.3
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D
0.4
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Solution

## The correct option is B 0.2From the given data we can say that the acceleration of the block is zero since it is moving at constant speed. Given, mass of the block m=10 kg and the applied external force F=19.6 N Let f be the friction force acting on the block ⇒ F−f=ma ⇒ F−f=0⇒ F=f=μmg ⇒ 19.6=μ(10g) or, μ=19.610×9.8=0.2

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