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There are nearly 14 laws of conservation based on symmetry principles in physics. Anything that happens must not be forbidden by a conservation law.
Some of the important ones are the following.
If no external force acts on a system of colliding objects, then the total momentum before collision is equal to the total momentum after collision, in the same direction.
Energy can neither be created nor destroyed. It can only be transformed from one form to another.
If no external torque acts upon a system, then the angular momentum of the system remains constant.
The total electric charge of an isolated system remains constant.