Conservation of momentum (article) | Khan Academy
https://www.khanacademy.org/science/hs-physics/x215e29cb31244fa1:forces-and-motion/x215e29cb31244fa1:conservation-of-momentum/a/conservation-of-momentum
WEBMomentum may be conserved in one direction but not in another. Momentum is conserved in the direction of F → net, but it is not conserved in the perpendicular direction. For example, in projectile motion, the momentum changes vertically because of the force of gravity downwards.
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