Think of it this way, it would require more energy to move that larger spoon compared to the smaller spoon. This energy is stored in the waters movement once you stop stirring as kinetic energy. More input (i.e. larger spoon) would mean more kinetic energy.
GotTheNameIWanted t1_j5t29eh wrote
Reply to 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
Yes.
Think of it this way, it would require more energy to move that larger spoon compared to the smaller spoon. This energy is stored in the waters movement once you stop stirring as kinetic energy. More input (i.e. larger spoon) would mean more kinetic energy.