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Why does water rotate when it flows down a sinkhole?

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There's usually some angular momentum of the water overall. As it gets closer to the drain, it spins faster, like a spinning ice skater pulling in her arms and reducing her angular moment. That's not all of it, though. The overall angular momentum is affected by small irregularities and asymmetries in the shape of the container. read more

There's usually some angular momentum of the water overall. As it gets closer to the drain, it spins faster, like a spinning ice skater pulling in her arms and reducing her angular moment. read more

The reason water rotates down the plug hole is actually due to both reasons previously stated. firstly, and mainly, water rotates in a specific direction due to the shape/ structure of the object it is in, as well as the way the water is moving at the time. the momentum (the mass of the water, multiplied by the velocity it is traveling at) in either direction (to the left or right) of the water would easily be enough to outweigh any other forces typically present. read more

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