Why friction even exists between two smooth surfaces? Why force of friction is greater if a rough surface is involved?
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Solution

Part a : 1.5 Marks
Part b : 1.5 Marks

A. Friction is caused by the irregularities on the two surfaces in contact. Even those surfaces which appear very smooth have a large number of minute irregularities on them. Irregularities on the two surfaces lock into one another. When we attempt to move any surface, we have to apply a force to overcome interlocking.

B. On rough surfaces, there are a larger number of irregularities. So the force of friction is greater if a rough surface is involved.

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Which will cause more friction: a rough surface or a smooth surface? Why?

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Q. Which factor is responsible for friction between two smooth and even surfaces?

On one hand you say that when two smooth, even surfaces slide over each other, there is adhesion between them which causes friction. On the other you say that there is no friction between two smooth surfaces. I'm not getting.

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Why friction even exists between two smooth surfaces? Why force of friction is greater if a rough surface is involved? [3 MARKS]

Why friction even exists between two smooth surfaces? Why force of friction is greater if a rough surface is involved?
[3 MARKS]