1. The problem statement, all variables and given/known data A particle of mass m slides without rolling down on a inclined plane, Find the generalized force and the Lagrangian equation of motion of mass m. 2. Relevant equations T = (mx'^2)/2 Generalized force Q=-d/dx(V) 3. The attempt at a solution To find the generalized force first I found the Potential energy and taking the derivative with the x, but my teacher said that the friction force should take into the account therefore I was told using the Work done, find the generalized force. How can I do that?