Talk:Spring oscillation

Comments by Tsirel
I fail to understand these phrases:
 * The force that pulls spring downward $$F=ma$$
 * The force of spring to return to equilibrium $$F_y=-ky$$
 * To maintain equilibrium, the net force act on pendulum must be zero or the two forces act on pendulum must be equal

Equilibrium? Not at all; rather, oscillations. I guess, this is just User:Quachthanh's original way of thinking about this matter (rather different from Newton's laws of motion). Boris Tsirelson (talk) 18:13, 2 September 2017 (UTC)