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In a later message Bob described the "landing wheel"
situation. One spinning wheel lands being oriented along
the direction of the velocity of C and another landing
being oriented at a 45 degrees angle. I think that this
is different from a situation in which the wheel has already
been rolling (along a given straight line, without being
powered) when its orientation was changed. Touching a
stationary floor (by a spinning wheel) is like "powering;"
the wheel pushes the floor backward and can gain speed.