### Definition of normal and tangential coordinates

2020-12-31u2002·u2002An r cross a theta. r hat cross theta hat gives you a k. r cross--and this force, the part of the force. We have two forces, one in the r direction and one in the theta direction. The cross product, this term up here, the T gives you nothing, r cross r hat cross r hat. So the only force that matters here is this Coriolis one. And so that force ...

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