Friction {drag, fluid}| slows objects moving through fluid. Drag increases if velocity increases. Pipe walls retard fluid flow by friction one millimeter into fluid.
Wing induces drag as it lifts {lifting line theory}.
Drag rises as velocity increases, while forward force stays constant, until forces balance with no more acceleration {terminal velocity}|. Feathers fall through air under gravity with terminal velocity.
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Date Modified: 2022.0225