Simple Harmonic Motion (SHM)

This is a simulation for simple harmonic motion:
$F=m \frac{dv}{dt}=-k*x$ ;

For the purpose numerical calculation, the above second order differential equation is transformer into two equations (first order differential equation):
$\frac{dx}{dt}=v_x$ // use this equation to calculate $x(t+dt)$ from $x(t)$ and $v_x(t)$
$\frac{dv_x}{dt}=-k*x/m$ // use this equation to calculate $v_x(t+dt)$ from $v_x(t)$ and $x(t), k, m$

With two initial conditions: $x(0)$ and $v_x(0)$ , the rest of $x(t)$ and $v_x(t)$ can be calculated.

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