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### 5 Cards in this Set

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 The Principle of Relativity – All the laws of physics are the same for uniformly moving observers, called inertial observers. – A system moving with a constant velocity is an inertial system. – There is no such thing as absolute rest or absolute motion: – Consequence: Motion is Relative, not absolute Principle of the Constancy of the Speed of Light – Light propagates in free space with a speed c that is independent of the motion of the source. – The speed of light measured wrt an inertial system must be the same for all such systems. – Consequence: Time is Relative, not absolute. Time Dilation • Time on a clock that is moving wrt an observer is seen to run slower than time on a clock that is at rest wrt that observer: Proper Time (TS) the time interval measured by an observer who sees the event begin and end in one place. • It is always the shortest time interval. • Observers in motion will measure longer time intervals Length Contraction • A moving observer measures an object to have a length along the direction of motion that is shorter than the length measured by an observer at rest wrt the object. • This is called length contraction and it is mathematically identical to the the Lorentz-FitzGerald Contraction discussed earlier.