Conservation of angular momentum | AP Physics | Khan Academy

Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/science/ap-college-physics-1 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. Sections: 00:00 - Intro 00:21 - Conservation of linear momentum 02:30 - Conservation of angular momentum 03:12 - Example 1 05:30 - Example 2 07:23 - Reaction wheels 09:49 - Ice skater 11:40 - Rotating stars ------------------ Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help! Donate here: https://www.khanacademy.org/donate?utm_source=youtube&utm_medium=desc Volunteer here: https://www.khanacademy.org/contribute?utm_source=youtube&utm_medium=desc