clipka <ano### [at] anonymousorg> wrote:
> Why should it?

  Because gravity points down at all points in the rod. There is no force
in the opposite direction counteracting gravity.

  If the rod were not welded to itself, it would definitely fall (until
it collides with the borders of the portal or whatever), no? Welding it
to itself doesn't change this. (Basically the only thing the welding
achieves is that it stops the rod from tilting.)

> Downward motion won't put the endless rod into a state of 
> lower potential energy, so it will not happen.

  The rod is not literally endless. It's just that the parts that go
thrown the portal on the floor are transported to the portal on the ceiling.
(From a physics point of view this would mean that the energy required to
transport matter adds to the potential energy of said matter if the endpoint
is higher than the startpoint.)

-- 
                                                          - Warp

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