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37 - Special Relativity I

# 37 - Special Relativity I - Physics 212 Special Relativity...

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Physics 212 Fall 2009 9/30/2009 Special Relativity

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Schedule Monday - Special Relativity I Wednesday - Special Relativity II (Course Evaluations) Friday - Last Class!
Special Relativity Observation of events in coordinate systems Define observer, event Synchronization of clocks Simultaneity Time Dilation Length Contraction Velocity Addition Paradoxes Implications Newton’s Laws, Maxwell’s Equations General Relativity

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Relative Motion - 1D Review Follow the ball as it moves. Displacement vector is drawn in a coordinate system, but which “reference frame” do we use? You see the ball moving (A), I see it stationary (B). If a frame has zero or constant velocity, it is called an inertial reference frame . x PA = x PB + x BA v PA = v PB + v BA For inertial frames, v BA =constant, so a BA =0 a PA = a PB + a BA a PA = a PB Note that if acceleration is the same, the forces felt in each frame are the same. Newton’s Laws of Inertia are valid in all inertial frames of reference
Special Relativity Measure events (things that happen) Where and when they happen, and by how much they are separated in space and time Einstein’s postulates - two simple statements that defy common sense 1. The laws of physics are the same for observers in all inertial frames.

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