Explain the origin of the force of friction.

Work done by the force of friction

8.Force Of Friction

Explain the origin of (i) sliding friction (ii) the rolling friction .

Define frictional force ( or friction) .

(i) Explain why friction is necessary to make the disc to roll in the direction indicated. (ii) Give the direction of frictional force at B , and the sense of frictional torque, before perfect rolling begins. (iii) What is the force of friction after perfect rolling begins?

A : Static friction force is a self adjusting force. R : The interatomic forces at the point of contact give rise to friction between the surfaces.

An artificial satellite in the presence of frictional forces will move into an orbit closer to the earth and may have increased kinetic energy. Explain this.

On a block of mass 10 kg a child applied a force of 5 N .Explain the position of block and kind of friction acts on it .