At terminal velocity, fluid friction is:

Explanation

Terminal velocity is the constant speed that a freely falling object eventually reaches when the resistance of the medium (such as air or water) through which it is falling prevents further acceleration. At terminal velocity, the forces are balanced, and the object experiences zero net force. This means that the fluid friction (air resistance) is equal to the force of gravity, and the object moves with a constant speed. Therefore, at terminal velocity, fluid friction is neither increasing nor decreasing; it is effectively zero in the sense that there is no further acceleration.