Algodoo

This scene shows what you can do with using console scripts and applying them. OnCollide gives you the opportunity to change other properties or itself, while Console and OnCollide allows you to change properties by hitting any block scripted to it. To me it's really easy, and it is a large portion of being useful for games, lessons, rube goldbergs, courses, contests or any scene for entertainment. I suggest to give it a try!

If you don't know how to script, I suggest looking for it in the algodoo forums, or search it online.