Rocket Launch Simulator
The simulation let's you add various stages to the rocket by clicking on parts of the rocket. Each stage adds fuel, ejection velocity and ejection rate, all that's needed to create force. Additionally you can define a payload and a target height.The simulation illustrates the need to do a bending manoeuvre, as the goal is orbital velocity horizontal to the Earth's surface.
In Danish: I have created a set of in-depth exercises on how to simulate rockets at computerfysik.dk: