State the laws of static friction.

1.	State the laws of static friction.
Answer» Laws of static friction : 1. First law : The limiting force of static friction (F_L) is directly proportional to the normal reaction (N) between the two surfaces in contact. F_L ∝ N ∴ F_L = µ_sN where, µ_s = constant called coefficient of static friction. 2. Second law : The limiting force of friction is independent of the apparent area between the surfaces in contact, so long as the normal reaction remains the same. 3. Third law : The limiting force of friction depends upon materials in contact and the nature of their surfaces.

Answer»

Laws of static friction :

1. First law : The limiting force of static friction (F_L) is directly proportional to the normal reaction (N) between the two surfaces in contact.

F_L ∝ N

∴ F_L = µ_sN

where, µ_s = constant called coefficient of static friction.

2. Second law : The limiting force of friction is independent of the apparent area between the surfaces in contact, so long as the normal reaction remains the same.

3. Third law : The limiting force of friction depends upon materials in contact and the nature of their surfaces.

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