How Fidget Spinners Work

A fidget fidget spinner is a toy that you can set spinning b holding the centre between two fingers and giving the rim a push.

When the fidget spinner starts to spin, it has angular momentum, with magnitude given by  
\[J= \omega I\]
, directed perpendicular to the plane of the spinner.

Just like linear momentum, angular momentum requires a force to change, in either magnitude or direction. And that is why fidget spinners are so much fun to play with.

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