How Yo-Yo's Work
The yo-yo is one of the oldest toys in existence. Despite its lasting popularity, it is one of the simplest toys around. The early versions of they toy were made simply from carved wood and a string. No one is quite sure of the origin of the yo-yo but many say China. Others say that ancient Greeks as far back as 2,500 years used yo-yos for entertainment. The motion and the process of playing with a yo-yo incorporates many concepts in physics of momentum, energy, friction, etc. With simply a spool and a bit of string a yo-yo is a fantastic model of physics hard at work.
In the first versions of the yo-yo, the string was tied directly to the spool, which made the yo-yo snap back up as soon as it was fully extended. In more modern versions of the yo-yo, the string is made into a loop around the spool, which allows for the yo-yo to "sleep" or keep spinning while fully extended. While the yo-yo is still in the user's hand, it has potential energy. It has the potential to fall, and also......
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