You’d imagine since I’m moving the whole unit as one, the whole thing would move. But only the cup twists.
In: Physics
It’s the law of inertia. Things at rest want to stay at rest and things in motion want to stay in motion. Since water provides very little friction the ice continues to stay at rest when you turn the cup. If you turn the cup faster or have a thicker thicker liquid you would be able to provide enough force to get the ice moving with the cup.
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