-=> Quoting Clarence Hogan to Stephen Williamson <=-
Heilsa,
 CH> Hey Steve, which is what I call my son Stephen, ya' just gotta teach
 CH> this old man "how cum" something which has no mass, has no momentum!
 CH> Likewise, splain "how cum" an object with mass at rest has no
 CH> momentum!
Just one of those durned laws of physics. :)  Momentum is dependent upon
an object's mass and velocity.  The formula for calculating an object's
momentum is p = mv (momentum = mass * velocity).  If either mass or
velocity are zero, momentum must also be zero (anything times nothing
is nothing).
 CH> And not to be smart, but this one is going to be extra hard
 CH> to splain, for the simple reason that the mass of any object is NEVER
 CH> at REST, right?
Maybe not in the grand scheme of things, but you can't ever measure
anything but the speed of light in the grand scheme of things, methinks.
You always measure velocity of an object as compared to another object,
usually one that *seems* to be at rest.  If you are standing still on
the ground, you will seem to be at rest to someone else who is also
standing still on the ground.  It all depends upon what frame of
reference you measure things in.  The speed of light is different
because no matter what frame of reference you are in (ie what velocity
you are moving at in relation to the light and its source), the speed of
light will always be measured at 300 000 km/s.  This gets into all those
damnable "Special Relativity" formulae that Einstein came up with, and
I'm only just learning those...
        In Frith,
                Stephen "Ravenwing" Williamson
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