OK peeps, just trying to pull my thoughts together here... I'm going to sum
up which (I think!) has been said so far, as I understand it, so folks can
tell me if I've got it right!
Motion constrained to the X-Y plane:
* Compute the resultant force acting on the particle as normal.
* Set the Z-part to zero.
* Compute motion as normal.
Motion constrained to a sphere:
* Compute resultant force.
* Constrain the force to a plane perpendicular to the string tethering the
particle.
* Compute motion as normal.
* Work out how far the particle has moved.
* Rotate the particle from it's initial position so that it moves the same
amount.
About that last step... I know how to work out the distance the particle has
moved... How do I work out how far to rotate? Angle = distance / radius or
something?
Andrew.
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