Momentum conservation {conservation of momentum} means that total momentum is constant, no matter which direction objects take through space. Momentum is invariant under spatial-coordinate translations. All directions are equivalent. Physical laws are symmetric with respect to space dimensions. Physics does not change if space directions reverse, rotate, or translate. Physical laws remain true at all space points.
System total momentum stays constant. For interacting objects, one object's momentum change balances other object's momentum change, because both objects interact over same time. For non-interacting objects, motion states and object masses do not change, so momenta do not change. Fields and their bosons carry or contain momentum and inertia.
Physical Sciences>Physics>Dynamics>Conservation
5-Physics-Dynamics-Conservation
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Date Modified: 2022.0224