https://www.khanacademy.org/science/ap-physics-c-mechanics/x077f5683c1428fac:linear-momentum/x077f5683c1428fac:conservation-of-linear-momentum/v/conservation-of-linear-momentum 2026-01-24T14:20:37.342605745Z Conservation of linear momentum Linear momentum is conserved in all interactions. If the net external force on the selected system is zero, the total momentum of the system is constant. If the net external force on the selected system is nonzero, momentum is transferred between the system and the environment. Conservation of momentum can be used to determine the velocity of objects in a system immediately before or after a collision or explosion. Mahesh Shenoy video https://cdn.kastatic.org/ka_thumbnails_cache/887b97d9-805e-46fd-ade1-11e90900a7c2_1280_720_base.png Conservation of linear momentum Linear momentum is conserved in all interactions. If the net external force on the selected system is zero, the total momentum of the system is constant. If the net external force on the selected system is nonzero, momentum is transferred between the system and the environment. Conservation of momentum can be used to determine the velocity of objects in a system immediately before or after a collision or explosion. https://cdn.kastatic.org/ka-youtube-converted/zQLxbN8dxJg.mp4/zQLxbN8dxJg.mp4 909 Conservation of linear momentum https://www.khanacademy.org/science/ap-physics-c-mechanics/x077f5683c1428fac:linear-momentum/x077f5683c1428fac:conservation-of-linear-momentum/a/collisions 2026-06-11T16:00:40.171915057Z Learn and try: Collisions Learn how to apply conservation laws to collisions. Explore linear momentum and kinetic energy in a PhET simulation. Compare the physics of slow, macroscopic collisions to the physics of high-energy particle collisions. article https://www.khanacademy.org/science/ap-physics-c-mechanics/x077f5683c1428fac:linear-momentum/x077f5683c1428fac:conservation-of-linear-momentum/e/conservation-of-linear-momentum 2026-06-19T17:56:42.733541135Z Conservation of linear momentum Check your understanding of conservation of linear momentum in this set of free practice questions. exercise https://www.khanacademy.org/science/ap-physics-c-mechanics/x077f5683c1428fac:linear-momentum/x077f5683c1428fac:conservation-of-linear-momentum/e/inelastic-collisions-ap1 2026-06-19T17:56:42.733541135Z Elastic and inelastic collisions Practice identifying properties of elastic and inelastic collisions. exercise https://www.khanacademy.org/science/ap-physics-c-mechanics/x077f5683c1428fac:linear-momentum/x077f5683c1428fac:conservation-of-linear-momentum/e/momentum-and-collisions 2026-07-05T20:00:48.94802762Z Momentum and collisions Apply your knowledge of momentum and collisions in this set of free practice questions. Molly Sauder exercise