I don't see the COAM violation, the rails would be attached to the Earth, whose own angular momentum would be (ever so slightly) modified to conserve AM of course.
If you added to the setup I described an externally generated magnetic field going through the track, the ball would go round the track wouldn't it, would this be a COAM violation? Michel 2009/8/25 Stephen A. Lawrence <[email protected]>: > > > Michel Jullian wrote: >> Good point, it would make it unidirectional, if not necessarily >> self-starting (dynamic friction is lower than static friction). So any >> magnetic field at play must be self generated. >> >> I wonder, would a ball put across two horizontal, static and >> concentric circular rails rotate by circulating current through it via >> the rails? If it did, this would invalidate your theory wouldn't it? > > Would violate COAM too if I understand what you're proposing. > > So, no, it wouldn't rotate. > > >> >> Michel >> >> 2009/8/24 Stephen A. Lawrence <[email protected]>: >>> >>> Michel Jullian wrote: >>>> There may be another cause for a net B field through the ring: the >>>> Earth's. (apologies if this was mentioned before, haven't followed the >>>> discussion closely) >>> Too weak to be significant, almost certainly, but more to the point a >>> fixed field through the ring would make the motor unidirectional and >>> self-starting. It's neither. >>> >>> >> >> > >
