I've been playing around with physics in flash for a while now. I've done some simple simulations myself, but those have mostly turned out to be sub-optimal. Recently i did a quick pass on the engines which are currently available for flash, and tried out a couple.
The one i kept coming back too was Box2d. It has a great community, both of flash users and the "main line" c++ version. The development is on-going, and there is a fair amount of documentation.
While the API is not super friendly, it has proven to do everything i've needed. Not always in the most straight forward fashion, but using google, the forum, wiki and manual, i've found answers to all my questions.
I can't say that about other physics packages. It is also quite fast, for a fair number of objects.
I'll be posting some demo and prototypes using this soon!
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