quote:
Originally posted by toddy
quote:
Originally posted by CookieRevised
If that would happen, you would have a perpetual machine! Which isn't possible
how would it be a perpetual machine 
because if it would move, it would keep on moving forever because nothing has changed in the system compared to the previous move because one end was connected to the other end. So, let's say it moves to the left (counterclockwise) on top, then a piece of the bottom chain would move a bit up to the right and a new piece from the once on top chain would become now the bottom chain. Again having equally amount of 'chain' on the top. Because it is the same length, mass, whatever as before. So the system is still the same. And hence, if it would have moved the first time it should be moving again now, (EDIT)
like a perpetual machine. But that isn't possible.
EDIT: I meant: it is _like_ a perpetual motion machine _if_ the first inital movement made sense and if there is something to maintain it (aka if there was some unbalance in forces).
I really should not post when I'm tired, sorry
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