In this paper we will prove that the Lorentz factor doesn’t exist on the relative motion. In fact this factor is the result of a wrong calculation of Michelson. His mistake was approved by Lorentz and other physicists, including Einstein. Michelson in order to implement his idea with his interferometer in 1881, made the following mistake: he made the calculation according to the only principle of relativity which was known by physics—the Galileo principle, but he didn’t faithfully apply this principle. In this paper, the principle of Galileo will be implemented exactly to Michelson’s experiment and the result will show us that physics doesn’t need the postulates of the year 1905.

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