Thanks for the support, Eeems!
Also, I'm keeping the physics library separate, so you guys can feel free to integrate it into your own games.

Well, I'd already tried and failed once, so this time it was a lot easier.  I just sat down with a pen and paper and worked the damn thing out.

Also, if anyone could make me a profile of Gordon Freeman, I would appriciate it greatly, and Alex Vance as well.

Water would be easy, I just won't support moving it
As for cloth, it would best be implemented as chains (the game being in side scrolling perspective), and it may in fact be possible.  I was thinking of attaching objects together with springs, which could be moved into chains and cloth.  The only problem is the 40 object cap would fill fast.

Sounds epic!  Cant wait to play around with the physics engine I should create a sandbox for my own engine now that you mention it...  And maybe an interface where you can add things like springs and joints

Water would be easy, I just won't support moving it
As for cloth, it would best be implemented as chains (the game being in side scrolling perspective), and it may in fact be possible.  I was thinking of attaching objects together with springs, which could be moved into chains and cloth.  The only problem is the 40 object cap would fill fast.

Well I am certainly gonna give it a try when you release that Physics library!

yunhua98, try to do it in a maximum of 7x14.
Horizontal map collisions are almost done, it works great!  I will be doing vertical collisions today, touching up both horizontal and vertical, then I will add gravity (easy) and release a demo.