From: utzoo!decvax!duke!harpo!uwvax!doug Newsgroups: net.misc Title: Re: Rotating Ants Spin the Universe Article-I.D.: uwvax.521 Posted: Sun Aug 1 11:41:54 1982 Received: Mon Aug 2 04:26:39 1982 One more thing. The poser of the question also said that "if velocity and acceleration are really relative..." I think, and someone will correct me if I'm wrong, that while velocity is certainly relative, that acceleration is not. I think acceleration is something that is fixed. As a matter of fact, it is precisely the experiment mentioned that partially verifies that: the spinning ant is accelerating. We can measure that acceleration, even in the absence of other frames of reference, by the fact that the ant experiences a force. Newton's laws are, for this reason, written in terms of accelerations. doug@uwisc