Why does a coin take 2 full rotations around another coin?

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  • Thread starter Devin-M
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In summary, a coin takes 2 full rotations around another coin due to the mechanics of rolling motion. When a smaller coin rolls around a larger stationary coin, it must complete two full rotations on its own axis for every complete orbit around the larger coin. This occurs because the smaller coin's circumference travels the same distance as the larger coin's circumference, resulting in the doubling of its rotations.
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