Lorentz Factor, g

There was a young lady named Bright Who traveled much faster than light, She departed one day In a relative way And returned on the previous night.

Length Contraction

The length of the object is measured to be shorter when it is moving relative to the observer than when it is at rest.

There was a young fencer named Frick, Whose thrust was exceedingly brisk, So fast was his action The Lorentz contraction Reduced his rapier to a disk.

A rectangular billboard in space has the dimensions 10mx20m A rectangular billboard in space has the dimensions 10mx20m. How fast and in what direction with respect to billboard would a space traveler have to pass for the billboard to appear square?

Relativistic Momentum

Mass and Energy

The law of conservation of energy is also valid for relativistic velocities.

The Correspondence Principle