Plane A plane flies through the air by generating forces that act against gravity and drag. Lift is the force created by the wings and acts against gravity. Lift increases as the speed of the plane increases. It also increases as the angle of attack increases. View the video on the right (from How An Airplane Flies by Shell 1975). Thrust is generated by the propeller and acts against the force of drag. The angle of attack is the angle at which the wings move into the oncoming air. There is a limit to how high the angle of attack can be. If it increases too much the wing is unable to generate lift and the plane stalls. All planes create lift by using curved surfaces on the top of their wings and all planes need to push air back in order to generate thrust. Propeller planes simply push the air in which they travel backwards while jet planes push hot gases, created by burning fuel, out of their engines. The questions below can best be answered when the student has read the text above and visited all the links prescribed. The wings generate speed lift drag gravity Thrust is the force that is generated by the wings the air generates to slow the plane as it moves through it. moves the plane through the air. force that makes the plane stall. The propeller generates thrust lift drag gravity The force that resists a plane moving through the air is called thrust lift drag gravity The force that supports the weight of an aeroplane is thrust lift drag gravity The force that opposes lift is thrust lift drag gravity The movement of an angled, precisely shaped wing through the air creates, around its surface thrust a difference in air pressure drag a difference in gravity The angle of attack is the angle at which the sings strike the oncoming air. the angle which the wings are fitted to the plane relative to the horizontal. the angle at which a fighter jet strikes its targets. The critical angle is the angle at which the attack of a fighter jet becomes critical the plane must come in to land a plane stalls due to reduced force of lift. no gravity is acting on the plane. A wing that has no curved surface will fly better and faster. generate little lift when level flying. have more drag acting on it. fly slower through the air What can increase the force of lift? a reduction in speed. increase in the angle of attack only. an increase in weight of the aeroplane. an increase in speed and the angle of attack All planes generate thrust by having aerodynamic wings. pushing air backwards. increasing the angle of attack. using the flaps on their wings. Activity