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AP Physics - Equilibrium

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Describe several situations in which an object is not in equilibrium even though the net force on it is zero.

I can't think of a single one. I can think of the opposite (equilibrium with net force not being zero) but I don't get it the other way around. Can someone explain?

  • AP Physics - Equilibrium -

    What about a car rolling at constant velocity?
    What about a top spinning at constant velocity?

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