Fluids behave and interact with forces differently than solids might.
A fluid cannot sustain a shear force (a force parallel to the surface).
When you’re talking about a fluid it is also more useful to observe bulk properties, not the actions of a single molecule.
When water is going through a garden hose, a single molecule might travel at 8000 m/s, but it doesn’t really matter since the overall flow of the water might be at 4 m/s.
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