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Given a road, one can solve a differential equation to get a wheel that will roll smoothly along the road in the sense that the center of the wheel does not move up or down. This Demonstration presents eight examples, the first being the famous one of a square wheel rolling on a series of linked catenaries. This example derives from the pure catenary case. The triangular case is of interest because the wheel actually crashes into the road before reaching the cusp. The parabola, given by ... , is unusual in that the wheel is exactly congruent to the road. For a given road the wheel will not necessarily close up; this is illustrated by the three cosine examples. When the standard cosine function has the distance of the road's top from the ... axis as ... , then the wheel closes up over ... periods of the road. The cases of ... and ... are illustrated, as well as a cosine case where the wheel does not close up.
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