Physics and Motion
Pendulums, dynamic circular movement, vectors, forces, etc...

Terrain Collisions
The code is really really condensed, and if you wish to have it be a bit more understandable, see this thread: www.kirupa ...
Random Connected Motion
I suppose this is more of the motion side of this category - random movement with lines drawn to the mouse :) Edit: Pretty s ...
Swirling Line v2
Version two of the swirling line thing. I've included both AS2 and AS3 source files. Just remember to remove the [AS] part of ...
Aerogel
Here is a quick experiment I did tonight and it ended up being only 30 lines of code and it could easily be condensed. Feel f ...