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A yo-yo (also spelled yoyo) is a toy which in its simplest form is an object consisting of an axle connected to two disks, and a length of string looped around the axle, similar to a slender spool. It is played by holding the free end of the string known as the handle (usually by inserting one finger in a slip knot) allowing gravity or the force of a throw to spin the yo-yo and unwind the string (similar to how a pullstring works), then allowing the yo-yo to wind itself back to one's hand, exploiting its spin (and the associated rotational energy). This is often called "yo-yoing". First made popular in the 1920s, yo-yoing remains a popular pastime of many generations and cultures. It was first invented in ancient Greece. In the simplest play, the string is intended to be wound on the spool by hand; The yo-yo is thrown downwards, hits the end of the string, then winds up the string toward the hand, and finally the yo-yo is grabbed, ready to be thrown again. One of the most basic tricks is called the sleeper, where the yo-yo spins at the end of the string for a noticeable amount of time before returning to the hand. Many yo-yo tricks are done while the yo-yo is said to be sleeping.〔(Easy Yo-Yo Tricks ), Editors of Publications International, Ltd., howstuffworks.com ^ (Advanced Yo-Yo Tricks for Kids ), Editors of Publications International, Ltd., howstuffworks.com〕 One of the most famous tricks on the yo-yo is "walk the dog". This is done by throwing a strong sleeper and allowing the yo-yo to roll across the floor, before tugging it back to the hand. English historical names for the yo-yo include ''bandalore'' (from French) and ''quiz''. French historical terms include ''bandalore'', ''incroyable'', ''de Coblenz'', ''emigrette'', and ''joujou de Normandie'' (''joujou'' meaning little toy). ==Etymology== Webster’s Collegiate Dictionary states that the word "yo-yo" derives from the northern Philippine Ilokano language word "yóyo".〔(【引用サイトリンク】url=http://www.merriam-webster.com/dictionary/yo-yo )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「yoyo」の詳細全文を読む スポンサード リンク
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