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was just thinking about this in class and it poped into my head while someone was spinning their water in their waterbottle

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    $\begingroup$ Welcome to Phys SE. Things to think about: Is the cup you swirl it in frictionless? $\endgroup$
    – controlgroup
    Commented Dec 4 at 20:49

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Will the water ever stop spinning?

Yes. Friction between the water and the walls of its container, as well as internal friction between different layers of water (called viscosity), will mean that the water will gradually lose energy and will eventually stop spinning.

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  • $\begingroup$ But will it ever stop spinning in space? $\endgroup$
    – Nickname
    Commented Dec 4 at 22:05
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    $\begingroup$ @RylieKutzke friction exists independently of gravity. $\endgroup$
    – paulina
    Commented Dec 4 at 23:04
  • $\begingroup$ Thank you @paulina $\endgroup$
    – Nickname
    Commented Dec 5 at 15:19

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