What defines the 'Lift' force acting on an unmanned aircraft?

The correct answer identifies lift as the pressure differential created by airflow over the wings of the unmanned aircraft. Lift is primarily generated through the shape of the wings, known as airfoils, which are designed to create varying air pressure above and below them. When airflows over the wings, it moves faster over the top surface than the bottom surface, resulting in lower pressure on top and higher pressure beneath. This difference in pressure generates an upward force that counteracts gravity and allows the aircraft to ascend or stay aloft. Understanding lift is fundamental to grasping the principles of flight, particularly for unmanned aircraft systems that rely on aerodynamic forces for stability and maneuverability.