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• Everything is moving.
• Land speed is always relative to the surface of the earth
• The earth is an inertial reference frame
• Velocity measurements depend of the inertial reference frame that is selected
• We must always assign the inertial reference frame which we pretend does not move.
• Special Relativity

  Postulate One: the laws of physics are the same in every inertial reference frame

  Postulate Two: the speed of light (c) is the same in every inertial reference frame
• Special Relativity

  Conclusion One: time flows at different rates for different observers
• Time Dilation. The faster you move, the slower time passes.
• Proper time interval, frame at rest with respect to the events
• Dilated time interval, frame in motion with respect to the events
• Length is relative
• At faster speeds objects and distances appear shorter, phenomena called length contraction
• Length contraction explains time dilation
• Length contraction explains phenomena surrounding certain fast moving particles