Why does a gyroscope stay upright?
Show answer & explanation
Answer: Angular momentum resists tipping
Magnetism stabilizes axis — Wrong. No magnetism. Gyroscope stability is mechanical—spinning creates angular momentum that resists changes to rotation axis direction.
Angular momentum resists tipping ✓ — Correct! Conservation of angular momentum: L = I×ω (moment of inertia × angular velocity). Spinning gyroscope has large angular momentum. Newton's 1st Law for rotation: angular momentum stays constant without external torque. Try to tip gyroscope—changes rotation axis direction—requires torque. Result: precession (axis traces cone) instead of falling! Bikes stay upright when moving (wheels are gyroscopes). Spacecraft use gyroscopes for orientation. Nature's gyroscope: Earth's axis!
Heavy wheel balances itself — Wrong. Weight distribution matters, but stability comes from angular momentum—spinning resists changes to rotation axis orientation.