What would cause the rotation of the earth to stop?

Answer 1

Nothing

According to Newton's first law of motion, an object in motion tends to stay in motion unless it is influenced by an outside force. The earth is an object in motion and exists in a vacuum.

Our sun will stop rotating, of course, when it expands into a red giant and possibly engulfs the earth in the very far future.

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Answer 2

Luke Allen

The rotation of the Earth could theoretically be stopped or significantly altered by a catastrophic event such as a massive asteroid impact, a collision with another celestial body, or a major shift in the Earth's internal dynamics, although these scenarios are highly unlikely in the foreseeable future.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.