Physically Incorrect

I’ve stumbled upon this little program: a 2D physics simulator. It’s much like Crayon Physics Deluxe and Fantastic Contraption, only it’s not really a game - it’s more of an open-ended simulator, without any goal. The physics are modeled, and while I haven’t tested out the different materials extensively (expect a bit of unrealism), it looks like quite an amazing feat.  Here’s a video of it from Youtube (although, judging from the number of views, I’m pretty late in discovering this gem):

And it’s free! Thumbs up from me.

Meanwhile, don’t forget the spinning wheel puzzle posted yesterday, still awaiting a solution.