John Carmack's QuakeCon 2005 keynote

"Carmack said he considers the prospects for the upcoming physics acceleration chip on the PC iffy, because physics presents a very fundamental problem that graphics doesn't have: it isn't easily scalable for level of detail."

I wonder if the primitives can be used easily for dynamics modeling. This would be interesting both from a development perspective, as a simulator, and from a deployment perspective, where the models could be used to make more accurate predictions (given a good model of the world) about a robots path, for example.