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Your diagram proves I was right. Any point on the wheel lower than halfway up is moving backwards. [^]
Quote from: DoctorBeaver on 12/07/2007 15:12:27Your diagram proves I was right. Any point on the wheel lower than halfway up is moving backwards. [^]No, I don't think so. No point on the outer rim is moving backwards until it goes below the track. Above the track, the point on the outer rim is still moving forwards until it becomes level with the track. Perhaps I'm not explaining it well enough. If the wheel was stationary, and you span it around the axle, then you are right - once the outer rim goes below then it does start moving backwards. This would happen for all of the wheel, not just the part that drops below the track. But its not stationary. On the diagram, it's only the little loop at the bottom that exhibits the backwards motion.
With proper trains that may be true; but not with British trains. A little bit of ice or leaves on the track and their wheels spin. [^]