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Starbucks__Coffey t1_j5ppyy6 wrote

Reply to comment by colcob in If I had two cups of water, one normal size and one as big as a swimming pool and stirred them both with proportionally sized spoons, would the larger pool of water keep spiraling longer than the smaller? by r3volc

>Even if the max velocity of the water is the same in the pool (ie a very slow rotation rate) then the energy of the water will scale somewhat with the volume of the water, ie cubicly, while the drag of the walls will scale somewhat with the area of the side walls, ie. squared, therefore the larger the cup, the more the kinetic energy of the water outweighs the drag of the sides.

The centripetal force increases friction aswell angular momentum. So it increases the energy lost due to friction aswell as the increase in surface area.

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[deleted] t1_j5pywbz wrote

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Starbucks__Coffey t1_j5vv1pp wrote

Yea I was just informing that the surface area increase also correlates with an increase in normal force. Idk how it interacts just that it was missed.

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