Question

which scientific thought explains why energy transformations take place?
lagrangian mechanics
the law of conservation of energy
the theory of relativity
the law of gravity

Explanation:

The law of conservation of energy states that energy cannot be created or destroyed, only transformed from one form to another. This directly explains why energy transformations occur. Lagrangian mechanics is a formulation of classical mechanics, the theory of relativity deals with space - time and high - speed motion, and the law of gravity is about the force of attraction between masses. None of these directly explain energy transformations like the law of conservation of energy does.

Answer:

the law of conservation of energy