The 4 Forces of Flight
By Paige Paquin
Lift is the force that holds an airplane in the air. With airplanes, the wings create most of the lift, that the plane itself uses. It is a partial vacuum created above the airplane's wing, causing the wing to be lifted upward.
Weight is the force caused by gravity. For instance, its weight is equal to a portion of the lift force and to a portion of the thrust force.
Thrust is the force that moves an aircraft in the direction of the motion. It is created by a propeller, jet engine, or rocket. Air is pulled in and then pushed out in opposite direction.
Drag is the force that acs opposite to the direction of motion. It tends to slow an object. Drag is caused by friction and difference in air pressure.