Which law states that energy cannot be created or destroyed?

The Law of Conservation of Energy is fundamental in understanding energy dynamics in physical systems. This law asserts that energy in a closed system remains constant; it can neither be created nor destroyed but only transformed from one form to another. For example, potential energy can convert into kinetic energy, such as when a roller coaster descends from a height, but the total amount of energy remains the same throughout the process.

This principle is crucial in various scientific fields, from physics to engineering, as it allows scientists and engineers to make predictions about energy transfer and efficiency in systems. The implications of this law fundamentally support concepts such as energy efficiency, energy transformation, and the understanding of physical processes in the universe.

The other options pertain to different concepts. The Law of Thermodynamics encompasses various principles about energy and heat transfer but does not exclusively define energy conservation. The Law of Motion relates to the behavior of objects in motion rather than energy transformation. The Law of Relativity deals with the physics of gravitation and motion in relation to the observer’s frame of reference, separating it from energy conservation principles.