OK i do not know about specifc books, but i can guide you for a brief manual about Fourier transform which i used it to comrehened it in general and to practice for some problems
it is written by james stewart the author of Calculas early transcendentals...
i think you mean by Fn: the normal force,Fg: gravititional force: and the Ff is due to friction
in an italic surface with constant speed the surface component of Fg is equal to Ff and so, the normal component to the surface of Fg is equal to Fn
so the ranking should depend on the slope of...