Nape, AS3 Physical Engine.

Recently, I found a interesting flash physical. Nape.
It has friendly API, and great efficacy.
I use it make a simple demo.

You might can easy creat some shape in the Physical world,
and describe each object's relative, or add seom power into it.

Car:
left key : move car to left.
right key: move car to right.
click mouse left key: add a shape into world.

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Source:
DownLoad

Cyber Source:
http://code.google.com/p/nape/
http://www.youtube.com/watch?v=3LGXdSnWEUc&feature=BFa&list=ULL6bDw5QqhFM
http://www.gotoandlearn.com/play.php?id=157