Friction is non-conservative force. How ?

A : Energy dissipated against friction depends on the path followed. R : Friction force is non-conservative force.

Is friction a non-conservative force?

Conservative Forces

Statement-1 : Friction is non-conservation force. Statement-2 : This is because work done against friction, in moving a body over a closed path, is never zero.

Choose the correct statements – (1) Force of friction is partically independent of microscopic area of surface in contact and relative velocity between them. (if it is not high) (2) Normally with increase in smoothness friction decreases. But if the surface area are made too smooth by polishing and cleaning the bonding force of adhesion will increase and so the friction will increase resulting in 'Cold welding' (3) Friction is a non conservative force, i.e. work done against friction is path dependent. (4) Force of fricton depends on area

Which one of the following is a non-conservative force ?

Assertion :- Work done by frictional force may be sometimes path independent. Reason :- Frictional force is a non - conservative force.

A : Work done by the frictional force can’t be positive. R : Frictional force is a conservative force.