Lift is the force that opposes gravity and keeps the airplane in the air. It is generated by the difference in air pressure between the top and bottom of the wings. The higher the airspeed, the greater the lift.

2. Weight

Weight is the force of gravity pulling the airplane down. It is equal to the mass of the airplane times the acceleration due to gravity.

3. Thrust

Thrust is the force that moves the airplane forward. It is generated by the engines. The greater the thrust, the faster the airplane will go.

4. Drag

Drag is the force that opposes the motion of the airplane through the air. It is caused by friction between the air and the airplane's surface. The faster the airplane goes, the greater the drag.