Find work done by friction for displacement 'S'?

Work done by frictional force

Work done by a frictional force is

Two block A and B are placed one over other. Blocks B is acted upon by a force of 20 N which displaces it through 5 m . Find work done by frictional force on block A . .

A body displaced from (1,1) to (2,2) along the line y=x under the force vecF=xhat(j)+yhat(i) then find the work done by this force for above displacement. (all units are in S.I.)

Find the work done by the frictional force in drawing a circle of radius r by a pencil of negligible mass with a normal pressing force N ( coefficient of friction mu_(k) ).

A force F acting on a particle varies with the position x as shown in figure. Find the work done by this force in displacing the particle from

Find total work done by friction assuming plank is sufficiently long. Solve this question in both ground frame and C-frame.

From figure, find the work done at the end of displacements: (a) 20cm, (b) 40cm, and (c) 80cm.