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Q.

When a surface is rubbed, it becomes smoother. How does this affect friction?

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a

Friction remains the same

b

Friction increases

c

Friction decreases

d

The force of friction between two surfaces tends to increase quickly.

answer is B.

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Detailed Solution

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A surface is rubbed to make it smoother. Then friction will decrease. 
When the surface is rubbed, the irregularities on the surface decrease, which makes it difficult for bodies to make a strong bond with the surface.

Hence, the friction decreases when the surface is rubbed to make it smoother. Sometimes surfaces are made smoother with the help of lubricants. It reduces undesirable friction. 
 

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