👉 Empennage is a concept in physics and engineering that refers to the ability of an object, such as a car or a ship, to accelerate at a constant rate. This acceleration can be caused by various factors, including the presence of friction, air resistance, or other external forces acting on the object. In the context of aircraft, for example, when a pilot applies pressure on the engines, they are able to apply an upward force that causes the aircraft to accelerate upwards at a constant rate.