In the engineer's lift formula L = Cl * (1/2)p * v^2 * s, what does L represent?

• A. Drag
• B. Lift
• C. Pitch Moment
• D. Velocity

Answer: (B)

In this equation, L is the lift force—the aerodynamic force that acts perpendicular to the relative wind and supports the aircraft in flight. The lift is produced by the wing and is determined by the lift coefficient (Cl), the dynamic pressure (1/2 times air density p times velocity squared v^2), and the wing area (s). The dynamic pressure captures how speed and air density translate into force, so increasing speed, air density, or wing area increases lift, while Cl reflects the wing’s shape and angle of attack. This lift is the force that counters weight; it’s not drag (which is parallel to the flow), not a pitch moment (a rotational effect), and not velocity (a speed, not a force).