Is angular momentum always conserved?

Question

Pick one of the following:

Yes, angular momentum is always conserved for any system.
No, angular momentum is only conserved when there is no net torque.
No, angular momentum is only conserved when the angular acceleration is constant.

Answer 1

No net torque

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Answer 2

If a equipment is closed or remoted, which capacity there are actually not any exterior forces and the forces occurring are in basic terms inner to the equipment, then linear momentum is conserved. If 2 gadgets collide, each and each merchandise's momentum is replaced. yet once you think approximately the two gadgets as aspects of a equipment, and the collision is an inner tension, then the full linear momentum (or the momentum of its midsection of mass) is conserved. capacity is barely conserved in thoroughly elastic collision. In any inelastic collisions, capacity is lost in kinds of sound and warmth and a great style of others.