There are two surfaces, A and B that are in contact with each other. Consider the following situations:
Situation I: Both A and B are at rest.
Situation II: A is moving over B, while B is at rest.
Situation III: B is moving over A, while A is at rest.

In which of the given situations would you expect the sliding frictional force to come into play?

Situation I only

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Situation II

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Both Situation I and Situation II

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Situation III

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Solution

The correct options are
B
Situation II

D
Situation III

We know that friction opposes the relative motion between two surfaces. This means that for friction to come into play, there should be relative motion between the surfaces and hence in situation II & III frictional force would come into play.

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There are two surfaces, A and B in contact with each other. Consider the following situations:

Situation I: Both A and B are at rest.
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In which of the given situations would you expect frictional force to come into play?

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The correct options are B Situation II D Situation III We know that friction opposes the relative motion between two surfaces. This means that for friction to come into play, there should be relative motion between the surfaces and hence in situation II & III frictional force would come into play.