It's called MIT's Assist Sketch Understanding System and Operation.
MIT Assist Sketch Understanding System and Operation works by sketching a simple mechanical device onto the drawing board and then demonstrating how the system understands the sketch through movement. (Magic Paper: drawing out ideas) (http://rationale.csail.mit.edu/projects.shtml)
ASSIST: A Shrewd Sketch Interpretation and Simulation Tool
Draw objects like ramps, carts, wheels, baskets with springs, then hit run and this program MIT is developing will process physics-based simulations on what you drew. I could spend hours messing with something like this, I need it! Give it to me, MIT!! :>
YouTube - MIT sketching