Hello, If we have a spring at rest and has a constant k=2 N/m (at its natural length with one end at origin (x=0) and the other end held stationary) is having a force applied on it. The force varies in same way as the the spring with function 2X. My question is how is it possible to start the spring moving if the spring is applying the same force as the force applied on it but in the opposite direction. In other words, booth forces are expressed by 2x how do they not cancel and how is it moving. Don't we need to apply a small force at first just to keep it moving.