WiiPhysics is a physics playground for the Wii, much like Crayon Physics or PocketPhysics. It uses Box2D and libwiisprite.

Changes

+Removed need for /data directory, compacting wiiphysics into single boot.elf file
+Added Undo Button
+Pulleys, Ropes and Gears (Pin) work great now
+Improved Icons and layout
+Line Drawing works perfect now
+Many Bug fixes, clean up

http://wiibrew.org/wiki/Homebrew_apps/WiiPhysics