Algodoo

It happened because YOU made it happen!


Okay, seriously... Two objects in Algodoo world cannot occupy the same space at the same time, exactly like in the real world. So, before the simulation runs, YOU placed a square in front of and slightly above a circle that has the same collision layers (A). When a user starts the simulation, the square falls directly in front of the circle causing the two objects to forcefully push a way from each other. That's all.

quarks and stuff?

Sure, whatever.

is 3D possible in algodoo?!?!

Well, sort of. Many people have tried to make "3D looking" objects with Algodoo (including me) with very limited success. Let's just say, it's difficult to make an object look and behave like a real world object because Algodoo is a 2D physics simulation app. In order to get convincing results, you have to understand the math and the real world physics of the 3D object that you want to make. It's actually easy to make a stationary "3D looking" object with Algodoo, but making it move and behave properly in a 3D simulated world is very difficult to do (well, it was for me!).