Introduction to Special Relativity
Special relativity gets a full undergraduate treatment from MIT OpenCourseWare, built around Einstein's 1905 paper and its consequences for space and time. The course works through length contraction, time dilation, the Lorentz transformation, relativistic kinematics, and Doppler shifts, including the classic paradoxes like the twin paradox and pole-in-the-barn problem. Materials include lecture notes, problem sets, and exams drawn from an actual MIT physics course, giving a structured path from the postulates of relativity to their stranger implications. The course assumes a background in mechanics and works through the mathematics rather than staying at a conceptual level, so expect derivations alongside the conceptual picture. Free to audit under MIT's open courseware license, with no certificate offered. Good preparation for later study of general relativity or electromagnetism.