Mo­men­tum:

Metro Canada (Ottawa) - - World -

spin­ning.

But it can’t spin for­ever. That’s a re­sult, in part, of

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.

re­sis­tance:

rolling

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