Which factors affect Lift?

The factors that affect lift are crucial for understanding how aircraft harness aerodynamic principles to achieve flight. Lift is generated by the movement of air over the wings, and several key variables influence this process.

Airspeed is fundamental; as the speed of the aircraft increases, so does the airflow over the wings, enhancing lift. The angle of attack is another critical factor; this is the angle between the wing's chord line and the oncoming airflow. Increasing the angle of attack increases lift to a certain point, beyond which stall may occur. Air density plays a significant role as well; at higher altitudes, the air is thinner, resulting in less lift. Lastly, wing shape, or airfoil design, directly affects how efficiently the wings can generate lift under various conditions.

Other options include factors that, while relatable to flight and aircraft performance, do not specifically address the aerodynamic principles that dictate lift in the same direct manner. For instance, wing span influences lift but is not as critical as the parameters listed in the correct choice. Engine power and humidity can affect overall performance but are not direct contributors to lift generation. Therefore, the selected answer neatly encapsulates the essential aerodynamic elements that work together to create lift during flight.