Thanks to Chipmunk Family

First of all, I would like to convey thanks to chipmunk famaliy, specially to Scott Lembcke, who is the author of the chipmunk physics engine. It is a 2D physics engine & open source. I have studied about it for one week deeply and found it very interesting. I can emplement any actions related to physics rules to  2D games. I have studied the codes of  the engine and all demos. They are very easy to emplement. As I am working with Nitro environment for nintendo DS, I have tried to use the engine in that environment. I have done some examples easily related with collition path, bounce, gravity, speed etc. The 7 demos reflects most of the physics rules. If anybody can understand all these demos clearly, he can emplement any action easily, I think. More over the engine has a forum. I have found lots of help from this forum and answers of my questions within very short time.
We can learn more about chipmunk here:
http://code.google.com/p/chipmunk-physics/wiki/Documentation
The forum of chipmunk:
http://www.slembcke.net/forums/index.php