Terminal velocity

Highest velocity attainable by a falling object

Terminal velocity is the maximum speed attainable by an object as it falls through a fluid. It is reached when the sum of the drag force (Fd) and the buoyancy is equal to the downward force of gravity (FG) acting on the object. Since the net force on the object is zero, the object has zero acceleration. For objects falling through air at normal pressure, the buoyant force is usually dismissed and not taken into account, as its effects are negligible.

This keyword could refer to multiple things. Here are some suggestions: