25.1 Introduction to the Special Theory of Relativity

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Introduction to the Special Theory of Relativity

SPECIAL THEORY OF RELATIVITY
Postulates 1. The laws of physics are the same in all intertial frames.
     An intertial frame is one for which Newton’s 1st Law applies.
2. The speed of light in a vacuum is constant in all intertial frames.
     (c~3.0×108 m/s)
Deductions/
Conclusions
• Simultaneity is NOT absolute.
• Time is relative; moving observers measure longer times.
• Distance is relative; moving observers measure longer distances.