What is defined as the ability to do work or cause a change?

Energy is defined as the ability to do work or cause a change. It is a fundamental concept in physics and is essential for understanding various processes in the natural world. Energy can exist in multiple forms, such as kinetic energy, potential energy, thermal energy, and more, allowing it to perform work across different contexts, whether that’s moving objects, heating substances, or powering systems.

The concept emphasizes that energy is a driving force behind change and activity in physical systems, which aligns with the definition presented in the question. Understanding energy is crucial not only in science but also in everyday life, as it helps explain how and why things happen around us, from simple mechanical actions to complex biological processes.