It has to do with our inner ear fluids, which tell our brains our orientation in space (up/down/around/etc). In a conveyance, such as a car, sometimes those senses get all confused because the body is stationary (0 mph), but the eyes and inner ear fluids are sensing that we’re moving a lot faster than 0 mph, so stuff gets weird.
Our bodies/brains developed before such fast conveyances were a thing, so they have to cope.
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