@Stefan, that could be a good way to do it, maintaining the consistency
with the rest of sympy's architecture. We could have something like
p = ChargedParticle('P', 3) (where 3 is the charge possessed by the
particle)
p.set_pos(O, R*x)
p.addtoWorld(world1)
The last line could update the kinematics of p according to the objects
linked to world1, while those objects would themselves also undergo changes
if necessary. However, keeping track of the ReferenceFrames would become
something of an issue.
In any case, addition of the 'world' concept, though distant atleast for my
project, would be a very powerful simulation tool for sympy users.
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