Physics demo uses the LiquidFun library to simulate a 2D sprite (beach ball) moving around in a liquid. It uses OpenGL ES 2.0 to render all physical interactions. While running the app tilt the device in any direction to move stuff around the screen.

I'm using a 2D Metaballs technique to render the liquid effect.

The source code for this app is available at my GitHub page.

LiquidFun - http://google.github.io/liquidfun/
2D Metaballs - http://nullcandy.com/2d-metaballs-in-xna/
GitHub - https://github.com/ChrisRBateman/OGLESPhysicsDemo