Chapter 20 - Relativity - Davidson Physics

Announcements Review The Twin Paradox Length Contraction Final QuestionsMeasuring an eventAn event is something that happens, to which an observer can assign three space coordinates and one timecoordinateExamples of possible events include:an explosionthe collision of two particlesthe passage of a pulse of light through a specified pointA given event may be recorded by any number of observers, each in a different inertial reference frameThe relativity of simultaneityIf two observers are in relative motion, they will not, in general, agree as to whether two events aresimultaneousIf one observer finds them to be simultaneous, the other generally will not, and converselySimultaneity is not an absolute concept but a relative one, depending on the motion of the observerRelativity