you put your hand in water and are able to move it freely why
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Interesting. The resistance force of water is proportional to the square of the velocity of the object moving through it. Move very slow, near zero speed, near zero resistance.
If your hand is moving slowly, water gently flows around your fingers and hand. Add the slightest more speed, it’s not so gentle. The shin deep water wasn’t moving very fast one day when it swept me clear across the aft deck of a research vessel. I was lucky that day. A bit faster, water can hold up a seaplane or a ship with hydrofoils. Faster still, one can cut steel with a jet of water.
Water can be gentle, it can also carve canyons.
Another interesting take of a similar question. Some may disagree but I think it’s similar.
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