d k b y
§2 the postulates 1. the relativity postulate: the laws of physics are the same for observers in all inertial reference frames, no frames is preFerred 2. the speed postulate: the speed of light in vacuum has the same value c in all direction and in all inertial reference frames discussion Einstein relativity develop Newton theory physIcs Mechanics rule rue
1.the relativity postulate:the laws of physics are the same for observers in all inertial reference frames.no frames is preferred 2.the speed postulate:the speed of light in vacuum has the same value c in all direction and in all inertial reference frames Einstein relativity develop Newton’s theory discussion physics rule Mechanics rule §2 the postulates
The i ght speed invar iability i s opposed to Gal i leo ve locity transformation Di fference in view Time scale Has no relation Newton Length scale with frame Mass measure relativity Time, space, mass C is has relation with constant reference frame
The light speed invariability is opposed to Galileo velocity transformation Difference in view Newton Time scale Length scale Mass measure Has no relation with frame relativity Time,space,mass has relation with reference frame C is constant
2 rentz transformation 1. transformation formula transformation Inverse transformation x'=r(x-ut x=r(x'+ut 2=2 B B
transformation Inverse transformation ( ) = − = = = − x c t t z z y y x x ut ( ) = + = = = + x c t t z z y y x x ut 2.lorentz transformation 1.transformation formula 2 1 1 − c u
cussIon. Has relation with X。LL u< C y->1 x=x-ut Galileo transformation t'=t
t x,u,t → 1 t t z z y y x x ut = = = = − Galileo transformation u << c discussion Has relation with