Gyroscopic precession occurs when:

Gyroscopic precession is a phenomenon observed in rotating bodies where an external torque causes the axis of the spinning object to move or rotate perpendicularly to the direction of the applied force. This is particularly evident in gyroscopes and spinning discs.

When a force is applied to a spinning disc, it does not alter the motion of the disc in the direction of that applied force immediately. Instead, due to the conservation of angular momentum and the nature of rotational motion, the effect of that applied force is observed 90 degrees later in the direction perpendicular to the original axis of spin. This results in the disc moving in a direction that is 90 degrees from where the force was applied.

The concept behind gyroscopic precession is rooted in the physics of rotation, where the motion is influenced not just by the direction of the applied force, but by the spin of the object itself. Understanding this concept is crucial in fields such as aerospace engineering, where gyroscopic effects play a significant role in navigation and stability of vehicles.