Angular Momentum
The rotational analog of linear momentum, defined as the product of moment of inertia and angular velocity.
Governing formula
L = I ω = r × p
SI unit
kg·m²/s (J·s)
In depth
Angular momentum is conserved in any closed system with zero net external torque (∑ τ = 0).
Examples in the real world
Spinning gyroscopes maintaining their axial direction, or planets accelerating as they swing closer to the Sun at perihelion.