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Mystery #1Tier 2-3spinning / motion

Why does a spinning skater speed up when they pull their arms in?

An ice skater spins with arms outstretched, then pulls them in tight, and suddenly whirls much faster, without pushing off anything. Where does the extra speed come from?

A figure skater spinning on the ice.
Photo: deerstop · CC0 (public domain) · via Wikimedia Commons

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