# How do we know a motion is periodic?

How do we know a motion is periodic? Is there a way to mathematically distinguish it from linear motion?

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How do we know a motion is periodic? Is there a way to mathematically distinguish it from linear motion?

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## Comments

Thank you both for the replies!! 🙂

But @prajputmentioned that rotation is also a periodic motion. How is that motion represented by a sinusoidal curve?