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As the airplane move through the air, there is another aerodynamic forces present. Some of the air resist the motion of the aircraft and the resistance forces is something called drag. drag is like directed along and opposed to the flight direction. Like lift,there are some monyfactors that sometimes affect of the forces including the shape of the aircraft, that stickiness of the of the air, and therevocity of the aircraft. Like lift, we collect all of the individual components' drags and combine them into a single aircraft drag magnitude. And like lift, drag acts through the aircraft centre of pressure.