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I'm gonna need some sort of a proof or something. I suck at physics without math.

> arg, I guess we don't have any other takers (i.e anyone that cares)

I was cooking :mad:

I don't see how a sphere has no coefficient of friction, even if it is perfect, unless you meant only...

Is the sphere accelerating? If it's a constant velocity it's a simple question of how much the friction is making it decelerate. If it's accelerating then it's just a question of interacting forces.