4 Forces of flight

The four forces of flight are Lift, Drag, Gravity, and Thrust. Without Thrust the plane would not move and no air would go over the and under the wings to create lift. So thust keep the plane moving and keeps it in the air. Lift is the most important. Lift is what keeps the airplane up in the air. Lift is caused by air going over the wing and the Branulli affect causing lift. Gravity may seem like it would not help the plane to fly, but it actually plays a key role because without gravity the plane would just keep going up and up and never come down. The last is drag. Drag is the force that pushes against the plane when it is flying. Without Drag the plane would never make it into the air because drag is air pushing on the plane and without drag there is no air and without air the plane couldn't fly at all.