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As I learned it back in 1968 As I learned it back in 1968 in Physics 101: Gravity is a mutual attraction generated by both the earths mass and the corresponding mass of the object. Centripetal force is generated by the spin of the earth as it acts upon the mass of the object. BTW gravity's attraction between 2 objects across space such as the sun and the earth (and the egg as well) also is a contributing factor when attempting to account for all forces acting upon the egg. Just sayin - - -

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