File:VaripendChain.gif

Scheme of varipend by Sergei Butov. The 3 material bodies are markes with black dots.

As the bodies, one by one, are released from the isolated rotating system, its center of masses displaces, giving violation of the Frist Law by Newton, and, in such a way, contradicting the basic concepts of the classical mechanics.

At the release of the 0th elementary body, the other two are supposed to move by the came circular trajectory.

However, the only displacement by the internal forces is claimed; as the center of mass moves, the total momentum is supposed to remain zero.