Law of conservation of energy: {Energy cannot be created nor destroyed. It can only change from one form to another}. As this law states, a system's Total energy will never change. However, it might gain a certain type of energy, and lose another simultaneously. Example:
This object has potential energy, which means the stored energy in it. It has potential energy because if the surface below it was removed, it will fall down, and thus gain kinetic energy. However, it will rotate around its own axis as well, thus gaining both linear and rotational kinetic energy:
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