creatR Free (iAd supported)

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This free version of creatR is iAd supported. Buy the full version to get rid of the ads, to save your creations, zoom and pan with infinite space, get a new cool rivet joint, and more intuitive gesture editing. Its just $2.99.
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creatR Free is a powerful 2D physics simulator for iPad. Using its easy-to-learn interface, even those with no physics background will be making complex simulations in no time. With simple tools, you can make just about anything.

Features:
-Motorized and Non-Motorized Pins
-Rod joint
-Rectangles and Circles
-Static and Dynamic Shapes
-Easily set attributes such as Mass and Friction
-Choose if you want your simulation accurate, fast, or somewhere in between
-Uses the full-featured Chipmunk Physics, the same engine used in other acclaimed iOS games