1. The problem statement, all variables and given/known data I am trying to derive the effective spring constant of two springs, with different spring constants, in series. I know the equation is everyone online, so the effective spring constant is k1k2/k1+k2. So the question is, when deriving it, the force exerted on each spring is constant, why is that?? 2. Relevant equations Hooke's Law -> Fx = kx 3. The attempt at a solution Is it because of Newton's third law? If so, how does that work?? Force of mass on spring 2 is equal to force of spring 2 on spring 1? So the force acting on each spring is Fg??