https://www.khanacademy.org/science/ap-physics-c-mechanics/x077f5683c1428fac:energy-and-momentum-of-rotating-systems/x077f5683c1428fac:conservation-of-angular-momentum/v/conservation-of-angular-momentum-ap 2026-03-18T14:20:48.260499955Z Conservation of angular momentum Angular momentum is conserved in all interactions. The angular impulse exerted by one rigid system on a second is equal and opposite to the angular impulse exerted by the second rigid system on the first. If the net external torque exerted on a selected system is nonzero, angular momentum is transferred between the system and the environment. The angular speed of a nonrigid system may change without the angular momentum of the system changing if the system changes shape by moving mass closer to or farther from the rotational axis. Mahesh Shenoy video https://cdn.kastatic.org/ka_thumbnails_cache/e9f000e1-8da3-4ca5-a21e-af304f603e12_1280_720_base.png Conservation of angular momentum Angular momentum is conserved in all interactions. The angular impulse exerted by one rigid system on a second is equal and opposite to the angular impulse exerted by the second rigid system on the first. If the net external torque exerted on a selected system is nonzero, angular momentum is transferred between the system and the environment. The angular speed of a nonrigid system may change without the angular momentum of the system changing if the system changes shape by moving mass closer to or farther from the rotational axis. https://cdn.kastatic.org/ka-youtube-converted/-7trrETEE7k.mp4/-7trrETEE7k.mp4 859 Conservation of angular momentum https://www.khanacademy.org/science/ap-physics-c-mechanics/x077f5683c1428fac:energy-and-momentum-of-rotating-systems/x077f5683c1428fac:conservation-of-angular-momentum/e/conservation-of-angular-momentum-2 2026-05-22T03:00:59.54221489Z Conservation of angular momentum Check your understanding of the conservation of angular momentum in this set of free practice questions. exercise