Final answer:
State events are also known as external events, referencing external forces that originate from outside the system and have an effect on its motion, in contrast to internal forces which cancel out.
Step-by-step explanation:
State events are also sometimes called external events. This is because, in physics, a system is defined by the boundaries of an object or collection of objects being observed; all forces that originate from outside of this system are considered external forces. These external forces are contrasted with internal forces, which act between components within the system. For example, when considering a system that includes a wagon and a child within it, the forces exerted by other children pushing the wagon would be external forces, as they originate outside the system of interest. Only external forces can affect the motion of a system, according to Newton's first law, as internal forces cancel each other out. Determining whether a force is external or internal is essential for correctly applying Newton's laws in various physics problems.