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So far centrifugal/petal-ism has not reared its head, but the apparentwhat
weight discussion reminds me to share a thought: The difference between
you feel when whirling round the Earth in the shuttle, as opposed tolesson,
whirling round horizontally in some machine in an amusement park is perhaps
a good way to introduce the idea that the mg "force of gravity" is unlike
other forces. This is a different lesson from the "apparent weight "
however.