Question

If a body is placed on a rough surface the value of static friction is________​

Answer 1

Answer:

Assertion(A): if a body is resting on a rough surface the value of static friction is zero. Reasons(R): If an applied force unable to move the body from rest then static friction is zero.

Explanation:

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Answer 2

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If a body is placed on a rough surface the value of static friction is more as compared to a smooth surfaces.

What makes the two surfaces different? It's due to irregularities between them. More irregularities, more rougher surface it is. Now for the body to move forward, more amount of force will be applied.

When there is less irregularities, less force is required to move the body. Smooth surfaces have less irregularities because the surface is now nearly plain.

Static friction acts between surfaces at rest with respect to each other. The value of static friction varies between zero and the smallest force needed to start motion. Hence, the value of static friction would be more for a rough surface as compared to a smoother one.