phys3313-lec2 - Physics 3313 - Lecture 2 Wednesday August...

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Physics 3313 - Lecture 2 8/26/2009 1 3313 Andrew Brandt Wednesday August 26, 2009 Dr. Andrew Brandt 1. Special Relativity 2. Galilean Transformations 3. Time Dilation and Length Contraction
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What do we mean by motion? Throw a ball, fly in an airplane… If you are watching the ground while you fly, you see motion, but if you are watching the seat in front of you you don’t. Motion: Change of position relative to something else Frame of reference is a part of description of motion 1905 Einstein Special Relativity (2005 World Year of Physics to celebrate) treats inertial frames of reference where Newton’s First law holds (remember that ? ) Body at rest stays at rest, body in motion stays in motion with constant velocity if no external force What about if there is a force? CH. 1 Relativity (Motion) 8/26/2009 2 3313 Andrew Brandt
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Any frame moving with constant velocity relative to an inertial frame is itself an inertial frame This implies that there is no universal frame of motion—everything is relative (especially in West Virginia) Person in car moving at constant velocity relative to person on ground equivalent to person on ground moving at same speed next to car (although he might get tired running 40 mph –backwards) General Relativity 10 years later (still Einstein) deals with accelerated reference frames and gravity (harder math—graduate class) Inertia/Relativity 8/26/2009 3 3313 Andrew Brandt
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Postulates : 1) Laws of physics are the same in all inertial frames 2) The speed of light in free space is a constant in all inertial frames Sounds fast! Is something missing? YES! the units: m/sec in this case; 186,000 miles/second What if it was nanometers/millenium (not so fast). Need units in physics!!! Special Relativity 8 3 10 cx = 8/26/2009 4 3313 Andrew Brandt
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Suppose an observer is in an inertial reference frame S, when an event occurs What are its time and place in a frame S’ moving at constant velocity with respect to frame S?
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This note was uploaded on 10/21/2009 for the course PHYS PHYS 3313 taught by Professor Andrewbrandt during the Fall '09 term at UT Arlington.

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phys3313-lec2 - Physics 3313 - Lecture 2 Wednesday August...

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