Another great activity from the Exploratorium Teacher Institute Project.
A flat panel rolls smoothly on non-circular rollers, providing a decidedly counterintuitive experience.
The most common closed and curved plane figure that has a constant width as it rotates is the circle. Surprisingly, however, there are other figures that have this property. You can construct a variety of these shapes with a compass and straightedge. The rollers you can build with this Snack behave in seemingly paradoxical ways.
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