Did you know that no matter how fast a train is moving forward, there
is always a part of the train that is moving backwards? Remember, a train
runs on a flanged wheel riding on the train track. The flange has a larger
diameter that the part of the wheel in contact with the track. The flange
is represented by the point outside the yellow gear, illustrated above.
Granted, the part of the train moving backwards is small and only moves
backwards for an instant before it starts to move forward again. There
is always a small part of the flange that loops from going forward to backwards
to forward again. Notice the tracing of the point outside the circumference
of the gear as the gear rolls along the rack.
Even though I stand by my reasons for drawing this curve in an upside
down orientation, I realize the explanation of the flanged wheel effect
would be easier to understand if the curve were in the normal position.
I plan to add a graphic to this page in the near future helping to illustrate
this amazing fact.
Edwin Attaway <edwin222@EdwinsAnimatedImages.com>