No apps for Tablet???
http://www.microsoft.com/windowsxp/downloads/powertoys/tabletpc.mspx
My HP TC4400 has had these installed for a long while, you get bored of them after a while. Suffice to say theres a drawing and animating package in there.
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After skimming thru the manual for K-Sketch it seems there are no physics in-built for autonomous gravitational and kinetics animation - you draw the paths yourself. A real shame as I thought it would have been natural to build physics into such a thing.
Theres a physics sim in the MS tablet powertools. Works pretty good but is simplistic.