Question

State the laws of friction and its applications

Answer 1

Answer:

1.When an object is moving, the friction is proportional and perpendicular to the normal force (N)

2.Friction is independent of the area of contact so long as there is an area of contact.

3.The coefficient of static friction is slightly greater than the coefficient of kinetic friction.

4.Within rather large limits, kinetic friction is independent of velocity.

5.Friction depends upon the nature of the surfaces in contact.

Explanation:

Answer 2

ANSWER :

1) Static Friction:- This state of friction is applied between two objects when they have been in contact for a long time and have no relative motion between them. Static friction is applied due to cold welding between the two surfaces of contact.

2) Sliding Friction(Kinetic Friction) :- This state of friction is applied between two objects when they have relative motion between them. Kinetic friction's magnitude is always less than or equal to that of the magnitude of the maximum static friction. Kinetic friction is always applied to reduce the relative motion, or it is applied opposite to the direction of relative motion.

3) Rolling Friction:- This state of friction is applied between two objects when at least one of the objects undergo rolling motion. Rolling friction is always applied in the opposite direction of the relative motion. So in this case too the friction is applied in the opposite direction to the rotation. Thus the friction is applied in the same direction as the motion of the rolling object. (Only in real scenario there is a depression in the object thus there is a friction applied in the opposite direction to the direction of motion.

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