how do non-swimmers just sink in the water while paddling very hard trying to stay above the water whilst swimmers have to do next to nothing to stay above it?
In: Physics
non-swimmers try to get their full head up, in more like an upright position of the body. They will fail, because the density difference is not high enough for the full head to emerge from the water. They will panick once the water level reaches the mouth, and things get worse.
Swimmers will try to just get the face out of the water. They will be comfortable enough to just stick half the head out, or even just the nose. They will also position the body horizontally, which helps putting the face (not the head) upmost.
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