Laws of Static Friction :
Following are the laws of static friction:
1)The force of friction always acts in a direction, opposite to that in which the body tends to move
2)The magnitude of force of friction is exactly equal to the force, which tends the body to move
3)The magnitude of the limiting friction bears a constant ratio to the normal reaction between the two surfaces.
4)The force of friction is independent of the area of contact between the two surfaces.
5)The force of friction depends upon the roughness of the surfaces.
Laws of Dynamic or Kinetic Friction :
Following are the laws of dynamic or kinetic friction:
1) The force of friction always acts in a direction, opposite to that in which the body tends to move.
2) The magnitude of the kinetic friction bears a constant ratio to the normal reaction betweenh the two surfaces.
3) For moderate speeds, the force of friction remains constant. But it decreases slightly with the increase of speed.
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