Yo-yo - Wikipedia A yo-yo (also spelled yoyo) is a toy consisting of an axle connected to two disks, and a string looped around the axle, similar to a spool It is an ancient toy documented since 440 BC
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Yo-yo | History, Characteristics, Facts | Britannica yo-yo, a toy that falls and rises back to the hand by the unwinding and rewinding of a string attached to an axle that connects two disks of equal size and weight The disks can be made of plastic, wood, or metal As a person drops the yo-yo, the string that is wound around the axle releases
How Yo-Yos Work | HowStuffWorks Both the classic yo-yo and the sophisticated "automatic" yo-yos that have sprung up in the past few years are remarkable demonstrations of fundamental scientific principles In this article, we'll examine these principles to find out what makes yo-yos behave in such an unexpected way