If the nose needs to move left, which way must the rudder move?

When the nose of the aircraft needs to move left, the rudder must be deflected to the left. This action creates a yawing motion that will turn the aircraft's nose in the desired direction. The rudder is used to control the yaw axis of the aircraft and is crucial for coordinated turns and maintaining control during flight.

By moving the rudder to the left, the aircraft will experience a differential horizontal force on the tail, causing the nose to pivot leftward. This function is essential during various flight maneuvers, such as turns or correcting for wind drift. Hence, to achieve the desired movement of the aircraft's nose to the left, the rudder’s movement must correspondingly be to the left as well.