Suppose two *inertial reference frames* S and S’ are moving with velocity **v** with respect to each other. Also suppose that an observer at reference frame S measures an event as and another observer at frame S’ measures the same event as . Now if we want to relate the measurements of S frame with S’ frame we have to use transformation equations.

If we take *Newtonian mechanics* granted then we use the *Galilean transformation. Galilean* or *Classical* transformation equations are:

Notice that the *time* co-ordinates are measured the same by both observer—that is .

But if we take *Special Relativity* instead of *Newtonian Mechanics* than we use *Lorentz* *transformation*. *Lorentz transformation* equations are:

The fraction is also called *relativistic gamma *.

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## About f.nasim

A CS undergrad from Bangladesh.

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