i have been studying on lagrangian dynamics. and got stuck at some point. normally on the systems that include mass and coils, i can do the calculations correct but when dampers go into the equation too i don't know what to do. do i just add them into equation like coils? for example the problem below. could someone give me a quick recap on steps i should follow. [URL [Broken] [PLAIN]http://img163.imageshack.us/img163/3401/soru2.jpg [Broken] [Broken][/URL] [PLAIN]http://img163.imageshack.us/img163/3401/soru2.jpg [Broken] [Broken] if there was no external force, and no dampers in the problem. i would do L=T-V , calculate T and V and take derivative of the equation on generalized coordinates and make it equal to zero. since there are dampers in the problem. am i just supposed to add those into V, and make the final equation, equal to f(t)? it would be really helpful if you could help fast, got exam in 2hours.