Terminal velocity

The downward force of gravity (Fg) equals the restraining force of drag (Fd). The net force on the object then, is zero, and the result is that the velocity of the object remains constant.

Creeping flow past a sphere: streamlines, drag force Fd and force by gravity Fg

Settling velocity Ws of a sand grain (diameter d, density 2650 kg/m3) in water at 20 °C, computed with the formula of Soulsby (1997).

Terminal velocity is the highest velocity attainable by an object as it falls through air. It occurs once the sum of the drag force (F_d) and buoyancy equals the downward force of gravity (F_G) acting on the object. Since the net force on the object is zero, the object has zero acceleration.

单词	Settling velocity
释义	Settling velocity 英语百科 Terminal velocity Terminal velocity is the highest velocity attainable by an object as it falls through air. It occurs once the sum of the drag force (F_d) and buoyancy equals the downward force of gravity (F_G) acting on the object. Since the net force on the object is zero, the object has zero acceleration.
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Settling velocity

Terminal velocity