Sept. 23, 2019

Kinetic Friction:

 If the applied force is increased further and sets the body in motion, the friction opposing the motion is called kinetic friction.

(i) Kinetic friction depends upon the normal reaction.

Fk  R or Fk = kR

(ii) Value of k depends upon the nature of surface in contact.

(iii) Kinetic friction is always less than limiting friction

Fk < FI  k < s

i.e. coefficient of kinetic friction is always less than coefficient of static friction.