10–15% of the AP exam. Key topics: Rotational kinematics: angular displacement, angular velocity, angular acceleration, Kinematic relationships between linear and rotational quantities: v = rω, a_t = rα, Torque: τ = r × F (magnitude τ = rF sinθ), Rotational inertia (moment of inertia): I = ∫r² dm, Parallel-axis theorem: I = I_cm + Md², Rotational equilibrium: Στ = 0, Newton's Second Law for rotation: τ_net = Iα, Connecting translational and rotational Newton's Second Law for systems with both.
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