Intro to Special Relativity - IB Physics

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And so the teacher said to the student, "Motion is relative, and Time is relative.". "I see", said the student. Then the student said, "So as Johnny in his spaceship passes by Fred in his spaceship, Fred believes that he is at rest spatially, and that it is Johnny that is in motion.". "Very good.", said the teacher. Then the student said, "Okay. So as Johnny in his spaceship passes by Fred's spaceship, Fred believes that his clock is at rest and thus is not ticking, but that it is Johnny's clock that is ticking.". LOL