A long board of mass m is placed on a smooth horizontal surface A long board with mass m is placed on a smooth horizontal plane. A slider with mass m slides along the board surface from point a to point B at a certain speed v. it advances L on the board while the board advances S. if the dynamic friction coefficient between the slider and the board is μ, how much work does the friction force do to the slider and the board?

A long board of mass m is placed on a smooth horizontal surface A long board with mass m is placed on a smooth horizontal plane. A slider with mass m slides along the board surface from point a to point B at a certain speed v. it advances L on the board while the board advances S. if the dynamic friction coefficient between the slider and the board is μ, how much work does the friction force do to the slider and the board?

Friction f = UMG
Work done by friction force on slider, w = f * (s + L)
Work done on the board, w = f * s
Work is equal to force times displacement