eli5: Why is it harder to pull things out of a pool than open air?

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Someone reminded me of that wife’s tale where it takes a crane to remove a mattress from a pool and that itself reminds me of how sometimes removing certain floaties from the pool could be needlessly hard at times while super easy other times. Why does this happen?

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A mattress is mostly air. Lifting a mattress out of water would usually involve the mattress being soaked. A soaked queen size mattress weighs about one metric ton.

Removing a floaty from a pool quickly usually sucks the water along with it, which acts like a suction cup, but doing so slowly has no such limitation as air can freely flow under it.

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