# Terminal Velocity

In fluid dynamics, an object is moving at its terminal velocity if its speed is constant due to the restraining force exerted by the fluid through which it is moving.

A free-falling object achieves its terminal velocity when the downward force of gravity (FG) equals the buoyancy/resistance force of drag (Fd). This causes the net force on the object to be zero, resulting in an acceleration of zero.

As the object accelerates (usually downwards due to gravity), the drag force acting on the object increases, causing the acceleration to decrease. At a particular speed, the drag force produced will equal the object's weight . At this point the object ceases to accelerate altogether and continues falling at a constant speed called terminal velocity (also called settling velocity). An object moving downward with greater than terminal velocity (for example because it was thrown downwards or it fell from a thinner part of the atmosphere or it changed shape) will slow down until it reaches terminal velocity.

Read more about Terminal Velocity:  Examples, Terminal Velocity in The Presence of Buoyancy Force

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### Famous quotes containing the word terminal:

All sin tends to be addictive, and the terminal point of addiction is what is called damnation.
—W.H. (Wystan Hugh)