Laws of Conservation

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:

Laws of conservation of linear momentum

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.

Law of conservation of energy

Energy can neither be created nor destroyed. It can only be transformed from one form to another.

Law of conservation of angular momentum

If no external torque acts upon a system, then the angular momentum of the system remains constant.

Conservation of charge

The total electric charge of an isolated system remains constant

Fore and Interia -

An interaction which causes an acceleration is called a force. Only when we push a ball does it begin to move. A ball lying on a horizontal floor doesn't start to move all by itself. For that matter, take a parked a car on a horizontal road. Only when we activate the engine and engage the gears does the engine impose some force on the wheels, which in turn, imposes force on the road to begin motion...

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