What gyroscopic effect causes an applied force to be manifested 90 degrees in the direction of rotation from the point of application?

What gyroscopic effect causes an applied force to be manifested 90 degrees in the direction of rotation from the point of application?

• A. Gyroscopic Procession
• B. Inertia
• C. Isogonic Line
• D. Knot

Answer: (A)

Gyroscopic procession (precession) is the effect at work. A spinning rotor has angular momentum directed along its axis. When a torque is applied, the change in angular momentum must point in the direction of that torque, but because the rotor is spinning, the actual motion you observe is the axis rotating around a perpendicular axis. This makes the response appear 90 degrees from where the force was applied, in the same sense as the rotor’s rotation. In other words, a push on a spinning rotor doesn’t move in the exact line of the force; the rotor tilts and its axis precesses sideways, with the effect occurring at a right angle to the point of application. Inertia is simply resistance to motion, but it doesn’t produce this 90-degree reorientation. Isogonic lines relate to compass variation, and knot is a speed unit—neither describes this gyroscopic behavior.

Gyroscopic procession (precession) is the effect at work. A spinning rotor has angular momentum directed along its axis. When a torque is applied, the change in angular momentum must point in the direction of that torque, but because the rotor is spinning, the actual motion you observe is the axis rotating around a perpendicular axis. This makes the response appear 90 degrees from where the force was applied, in the same sense as the rotor’s rotation. In other words, a push on a spinning rotor doesn’t move in the exact line of the force; the rotor tilts and its axis precesses sideways, with the effect occurring at a right angle to the point of application. Inertia is simply resistance to motion, but it doesn’t produce this 90-degree reorientation. Isogonic lines relate to compass variation, and knot is a speed unit—neither describes this gyroscopic behavior.