Inspiration for developing something useful for teaching and visualizing Physics came from the difficulties I felt  while teaching my students deep concepts of physics, so we needed a toy to hang on. I first tried finding on internet which could be of some use, but what I could find was animations or very specific simulations. So I decided wring my own.

The first step in the process was taken way back in 2010, where I wrote a tiny physics engine in VB.net. The engine was mainly a port from Action-Script Engine written by Alen Clove with some modification for constraints and dynamics. It was really a nice experience and huge fun. You can find it on VBforum and Planet Source Code as open source projects.