kallog, one more thing.
Your mistake is a third newtons law consequence of modern classical mechanics where translational momentum must be equal. For simple form where objects have same translational motion - yes.
However in our case it doesn't work.
Ok. Let's imagine simples case where objects are rolling on one side only. Let's assume the translational momentums for our case equal. Then, forces which induce translational motion must be equal too. But which force induce rotational motion? Yes, the objects rotation in both direction are equal. But what force? We don't any spring inside subset of rolling objects. Just weightless platform between them.

Last edited by ABV; 03/02/11 04:28 PM.