Work done by a frictional force is

STATEEMNT-1 : Work done by frictional force is always either negative or zero. because STATEMENT-2 : Work done by the static friction on a system may be zero.

A) Work done by frictional force is always negative B) A body at rest can have mechanical energy C) Mechanical energy of freely falling body decrease gradually

Work done by frictional force

Work done by frictional force

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

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

Assertion : Work done by the frictional force is negaive Reason : This is because frictional force acts along the dirction of motion