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Length Contraction - Length contraction is analogous to time dilation, in the sense that it is a phenomenon that is observed of objects in moving frames of reference.  As in the previous section, consider an observer who is stationary in a particular frame of reference, which we will call frame A (e.g. someone standing still on a flat road - the road being the frame of reference).  Suppose that this person has a rod that has length L.  Now consider a second observer in a frame of reference (frame B) that is moving with respect to our original observer (e.g. in a car), and suppose that this observer also has a rod of length L, as measured in frame B. (Definition provided by Marts100)

Equations 

  Velocity

C   speed of light

 Lorenz Transform

l   length from a "stationary" point of view

l' length from a "moving" point of view