Why Does a Yo-Yo Yo?

In the original yo-yo design, the string was secured to the axle. In the modern design, the string is only looped around the axle, allowing the yo-yo to "sleep."

A yo-yo design with a ball bearing arrangement: Ball bearings reduce friction between the string and the axle, making it easier for the yo-yo to "sleep."

http://www.explainthatstuff.com/yoyos.html

 

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