Adam, Before Einstein Newton ruled and acceleration used to be equal to F/m Then it was noticed that acceleration of massive particles in cyclotrons decreased as their velocity increased.
There were three logical interpretations of this experimental evidence: 1) Force decreases as velocity increases 2) Mass increases as velocity increases 3) Both of the above Einstein arbitrarily chose interpretation #2, although there was no direct evidence of mass increase. Additionally all the experiments accelerating massive particles to high velocities used the electric or magnetic forces to accomplish this feat. It is conceivable that the interpretation #1 or #3 is correct too, and the effect of decreasing force with increasing velocity is only the property of EM interactions, which vanish at the speed of light. There is no experimental evidence that shows decreasing acceleration of mass with increasing velocity for non-EM type of forces. (e.g. caused by chemical explosions in a rocket) This is why I have a problem with the Special Theory of relativity, too. Regards, Horace Smith At 20:19 2004.10.27, Adam Cox <[EMAIL PROTECTED]> wrote: ><snip> >According to Relativity (which I have problems with, but thats another story) Mass >increases with velocity.
