Do a free bodied diagram. Hint if you are standing still on the earth then the earth is not spinning relative to you from your frame of reference. At what frame of reference is that measurement allegedly taken? This is irrelevant to the shape of the earth and would give the same answer either way because it is not spinning relative to you if you are standing still on either a globe or flat earth just the same. Additionally in the spinning tennis ball example below the object is experiencing angular acceleration where as this would not happen or happen less with a spinning tennis ball experiencing zero angular acceleration but spinning at a constant angular velocity.
Copyright Carl Janssen 2018 December 9
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