conservation of energy

Conservation of energy is the principle that energy cannot be created or destroyed; it can only change from one form to another. For example, when you lift a book, you give it potential energy. When you drop it, that energy converts to kinetic energy as it accelerates downward. Throughout this process, the total energy remains constant, just shifting between forms. This principle applies everywhere in nature and underpins much of physics and engineering, ensuring energy flows and transformations follow predictable, consistent rules.