Aerodynamic forces and moments are created by air movement above the Military Aircraft. The aerodynamic forces and moments fluctuate with altitude as a result of changes in the air's physical characteristics. To study aircraft motion, flight dynamics considers these aerodynamic forces along with thrust and gravity forces. In order to examine the dynamics of the flight path, including the stability and controllability of the aircraft, additional aerodynamic forces created by the deflection of control surfaces are included as applied control forces.
The three fundamental aerodynamic equations of conservation of mass, conservation of momentum, and conservation of energy govern airflow over a body. After solving these equations, we may estimate forces and moments by looking at the velocity distribution over the Military Aircraft surfaces. The air flowing over the higher surface must go a greater distance than the air flowing over the lower surface because of the airfoil's camber. Due to camber, air particles on the upper surface move faster to cover a greater distance in accordance with the law of conservation of mass than the airflow over the lower surface. The law of conservation of momentum states that a drop in pressure offsets a gain in speed.
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