Question

Refer the above attachment

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Answer 1

Answer:

1) The friction between the two surfaces is because of the interlocking of the irregularities of the two surfaces. During sliding, contact points do not get enough time to get interlocked properly. Therefore, less friction.

This explains why sliding friction is less than static friction.

2) A frictional force is created when the tip of the pen comes in contact with the surface of the paper. Rolling friction is what comes into play while writing with a ballpoint pen while sliding friction arises when one writes with a pencil.

Explanation:

Hope it helps!