- #1
Davio
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Hey guys, what exactly is a 3 momentum? I can't any references to it anywhere on the net, which actually tells me what is it, I know a energy 4 momentum is, px , py, pz e/c, but that's not much help!
Davio said:Hey guys, what exactly is a 3 momentum? I can't any references to it anywhere on the net, which actually tells me what is it, I know a energy 4 momentum is, px , py, pz e/c, but that's not much help!
ehj said:Shouldn't it be?
[tex]\sqrt{||L||^2-(ct)^2}[/tex]
robphy said:3-momentum is the "spatial-part" of the 4-momentum.
Here is one place to consult:
http://www2.maths.ox.ac.uk/~nwoodh/sr/ [Broken]
Davio said:why is it -(ct)^2 and not positive?
Momentum is a physical quantity that describes the amount of motion an object has. It is calculated by multiplying an object's mass by its velocity.
Momentum is measured in units of kilogram-meters per second (kg•m/s).
The equation for momentum is p = mv, where p is momentum, m is mass, and v is velocity.
The principle of conservation of momentum states that in a closed system, the total momentum before an event must be equal to the total momentum after the event. This means that momentum cannot be created or destroyed, only transferred between objects.
Momentum plays a crucial role in collisions. In an elastic collision, the total momentum of the objects before and after the collision remains the same. In an inelastic collision, some of the momentum is lost as heat or sound, but the total momentum still remains constant.