Angular momentum conservation {conservation of angular momentum} means that total angular momentum is constant, no matter what rotations (spins or orbits) objects take, at any orientation. Angular momentum is invariant under rotations. Angular momentum is invariant under handedness change, right-handed or left-handed. All rotations are equivalent. Physical laws are symmetric with respect to rotation. Physics typically does not change if spin directions reverse or change orientation. Physical laws remain true for right-handed or left-handed arrangements.
System total angular momentum, from spins, orbits, and curved trajectories, stays constant. Using infinite radius, angular-momentum conservation is equivalent to momentum conservation. Angular-momentum conservation implies that system mass center stands still, so universe either does not rotate or does not move. Angular-momentum conservation implies that forces have equal and opposite reaction-forces and that masses have inertia.
Physical Sciences>Physics>Dynamics>Conservation
5-Physics-Dynamics-Conservation
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Date Modified: 2022.0224