Simulate two springs holding a weight using different numerical integrators. Drag and release the ball to start movement.
Simulate a spring connected to a weight. There are no additional forces other than the initial thrust. Drag and release the ball to start movement.
The results obtained were compared. Between Runge-Kutta methods and Semi-implicit Euler the differences were minimal. On the other hand when using Euler integrator there is a gain of energy over time. From now on only Semi-implicit Euler will be used.