Train Wheel Cycloid

Author:Steve

A variation of a cycloid ... the locus formed by a point on the circumference of the flange of a train car wheel. Can you show that a portion of the wheel is moving backwards?

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Viviani's Curve
apec
Hyperbolic Paraboloid
Fourier Lissajous (Mechanical)
Some random function

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Conjecture & Proof
Intersection of Cones Isn't a Cone
Knot 5_2 (The Three-twist Knot)
انتخاب شماره

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Area
Volume
Median Value
Linear Programming or Linear Optimization
Probability