Metro Canada (Toronto) - - SCIENCE -

The out­side of the spin­ner spins for so long af­ter a sin­gle lick thanks to an­gu­lar

mo­men­tum: The im­pulse a spin­ning ob­ject has to keep spin­ning. But it can’t spin for­ever. That’s a re­sult, in part, of rolling

re­sis­tance: Some of the en­ergy from the irst spin is lost over time, in the form of heat, slip­page, and the sur­face of the ball and the sur­face of the case be­com­ing slightly warped over time.

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