Physics sims/microworlds

Thanks for Physics Phun
(posted on February 22, 2008 by Daniel Livingstone)

Which describes 2 new physics sims: Phun and Crayon Physics

for similar stuff see:
linerider
soda constructor
Armadillo run


see also
http://curvebank.calstatela.edu/home/home.htm
http://www.ct4me.net/math_manipulatives.htm
http://www.fi.uu.nl/wisweb/en/welcome.html
http://objectsevolve.wikispaces.com/
http://schoolgamemaker.rupert.id.au/samples3/