The curved glass inclinometer in the turn-and-slip indicator indicates which relationship?

• A. The relationship between gravity and centrifugal force
• B. The relationship between airspeed and altitude
• C. The relationship between thrust and drag
• D. The relationship between climb rate and acceleration

Answer: (A)

During a turn, gravity acts downward and inertia (often described as centrifugal force in the rotating frame) acts outward. The curved glass inclinometer shows the balance between these two forces by the position of the liquid and bubble in its curved tube. The reading indicates how much of each force is present and how the forces combine, which helps you judge whether the turn is coordinated. It is not about airspeed and altitude, thrust and drag, or climb rate and acceleration.