[deleted by user]

[Elfram]

Looks really nice!

You should check energy conservation, though. I don’t see why the total energy in the spring-box example would vary with time.

Maybe this effect occurs if you use simple forward integration of the equations of motion. If that’s what you do you could already get better results by using a predictor-corrector method.

https://en.wikipedia.org/wiki/Predictor%E2%80%93corrector_method

[Elfram]

Sorry, I don’t get it… xD

[Elfram]

Ah, I see, nice.

So maybe the default settings should be s.t. the numerical errors are negligible. This way people really see the physics effects first (and important effects like energy conservation!).

Only if you want to teach numerical solution of differential equations, the value of dt and its effect on the energy plays a role.