Angular impulse–momentum theorem (dL/dt = τ_ext; angular impulse = ΔL)

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dL/dt = τ_ext; angular impulse = ΔL

What each symbol means

SymbolWhat it stands for
LAngular momentum about that point/axis
τ_extNet external torque about the same point/axis

When to use this

Inertial frame; same reference point for L and τ.