A spring obeys the linear force law[br][math]F=-k\cdot x[/math][br](F force in N, k spring constant in N/m, x deflection in m).[br][br]The solution to the equation of motion[br][math]m\cdot \ddot x\left(t\right)=-k\cdot x\left(t\right)[/math][br]is[br][math]x\left(t\right)=A\cdot sin\left(\omega t-\varphi\right)[/math][br]