My professor told us that it is possible to see the friction in a mass-friction-spring as the contribution of a closed loop control system. He wrote the following formulas:
Transfer function: $$G(S)=\frac s {s^2+\frac k M}$$ gain: $$\rho=h/M$$ where k=spring constant, h=friction constant, M=mass
Can you recognize these formulas and give me some indication about this method? I think it would be useful to understand what is the meaning of the transfer function is this case?