Law of Conservation of Energy

Energy when considered in all its forms, is automatically conserved. The total amount of energy remains numerically constant in time (although some of energy may swap from one form to other).

Whenever one object exerts a force on another object - either a pull or push. Physics can introduce a Potential Energy (or other form of energy) such that a Law of Conservation of Energy holds.

This is ofcourse, a remarkable property of nature, not just a sign of Physicists ingenuity.

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