Why do liquids in a cup remain in the same place while the cup is being rotated?
In: Physics
Because there isn’t enough force to force them otherwise. When you spin a glass the edges of the glass and the outer most layer of liquid touch and then the edge exerts a force on that liquid which then exerts its force to the liquid next to it and so on. Because each time this happens there is less and less force being exerted the liquid usually stays still but if you would rotate the glass really fast then even the liquid would start spinning.
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