Gyroscopic Precession
A spinning top wobbles because angular momentum resists gravity's torque
Precession rate: — rad/s
Precession rate Ω = mgr / (Iω), where m is mass, g gravity, r the center-of-mass distance, I the moment of inertia, and ω the spin rate. Faster spin → slower precession. This explains why Earth's spin axis traces a 26,000-year circle (the precession of the equinoxes), why gyroscopes hold direction, and why a leaning bicycle doesn't fall.