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Here is something that I plan to try. Feel free to use the same
(or better) approach and share your observations. Let them
videotape the bob of a conical pendulum, looking from below.
Then ask them if the motion of the bob satisfies Kepler's
laws.
That "law" will be satisfied, the trajectory is likely to be
elliptical. By measuring a and b they will be able to locate
the two focal points. But the second Kepler law will not
be satisfied. ...