👉 A semibody is a type of physical system that consists of two or more bodies, each with a unique property. These properties are such that they can be used to describe different aspects of the behavior and interactions between these bodies, making them useful for modeling complex systems in physics and engineering. In particular, a semibody has a set of constraints on its motion that allow it to behave as a single body under certain conditions, while still being able to interact with other bodies through forces or interactions