### relativistic momentum

(momentum of an object including relativistic effects)

**Relativistic momentum** is the momentum of an object, taking
relativity into account. It is not relativistically invariant.

The term mass (i.e., with no qualifying adjective)
has come to be used two ways in light of relativity:
to mean the object's **rest mass**, which is the mass as we normally think of it,
or to mean a **relativistic mass**,
the mass equivalent of the object's total energy,
including kinetic energy and relativistic effects. (Effectively,
this potential terminology-confusion only arises due to relativity, and
the difference is only for a moving object, and significant
only if at relativistic speeds.)

Formulas for momentum:

relativistic momentum = γM_{rest}V
or given M_{rel} = γM_{rest},
relativistic momentum = M_{rel}V

- M
_{rest} - rest mass.
- M
_{rel} - total mass including the rest mass, and the mass-equivalent of kinetic energy including relativistic effects.
**γ** - Lorentz factor: (1-V²/C²)^{-½}
- V - speed of the object.

(*physics,relativity*)
http://en.wikipedia.org/wiki/Momentum

http://hyperphysics.phy-astr.gsu.edu/hbase/Relativ/relmom.html

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