👉 A non-inertial system is a system in which there are no forces acting on it, such as gravity or friction. In other words, the objects or masses in a non-inertial system do not experience any external forces that would cause them to accelerate. This concept has applications in physics, engineering, and science, where it's used to model systems where forces are not directly proportional to mass or volume. For example, in rocket propulsion, the thrust of an engine is not directly related