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Did you know that there is always a part of a standard passenger train that is going backwards,as the train travels forwards. In fact, the faster, forwards it travel, the faster this part goes backwards!(I really hope this is true, otherwise I'm going to look like a right small flighty creature)
I'll give you a hint - what do you find up your nose?
Quote from: dentstudent on 12/07/2007 12:23:13I'll give you a hint - what do you find up your nose?fingers!
LOL Thanks Paul I was going to say it but You saved me !!! AH Chivalry is not dead! LOL .. I still don't know looking at this picture!
Getting closer......you're on the right track, maybe you should look under it?
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. [^]