* Thrust: This is the force that propels the aircraft forward, generated by the engines.
* Drag: This is the force that resists the aircraft's motion through the air.
Here's how they relate:
* Thrust overcomes drag: For an airplane to move forward, the thrust generated by its engines must be greater than the drag created by the air resistance.
* Lift: Another important force is lift, generated by the wings, which pushes the aircraft upwards.
Therefore, an airplane doesn't "pull" - it's pushed forward by thrust and held aloft by lift, while fighting against drag.