THRUST

Thrust: The force created by a power source which gives an airplane forward motion by either pulling or pushing an airplane forward.  A conventional airplanes will use an engine(s) and propeller(s) to obtain thrust.  Thrust is that force which overcomes (opposite of) drag.  PD Definition: Since it is the opposite of drag (see PD drag definition)  something we appreciate in a date!

DRAG

Drag: The force which delays or slows the forward movement of an airplane through the air when the airflow direction is opposite to the direction of motion of the airplane. It is the friction of the air as it meets and passes over and about an airplane and its components. The more surface area exposed to rushing air, the greater the drag.   PD Definition:  What no Plane Dame wants her date to show up in.

LIFT

Lift: Produced by a lower pressure created on the upper surface of an airplane's wing compared to the pressure on the wing's lower surface, causing the wing to be "lifted" upward. The special shape of the airplane wing (airfoil) is designed so that air flowing over it will have to travel a greater distance faster, resulting in a lower pressure area thus lifting the wing upward. Lift is that force which opposes the force of gravity (or weight).  PD Definition: Why WonderBra is our favorite!