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Title: Simple Harmonic Motion (SHM)Post by: Fu-Kwun Hwang on January 30, 2012, 09:20:58 am
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. |