That depends entirely on how you magic up the explanation though, doesn't it? Mass Effect also has TK like powers in biotics, yet does not appear to violate conservation of momentum. I would simply assume that the 'mass effect' magic is basically independent of the person using it (or the gun firing it) and hence the 'conversation' rules are applied differently. It's no diffrent than any other 'magical TK-like effect' you get in sci fi or even fantasy (EG The Force in SW or Warp powres in 40K.) It can even explain the Normandy having a reactionless drive.Xon wrote:The Mass Effect also violates conservation of momentum. And arguable, weakly, violates conservation of energy.
That is a projectile in the mass accelerator has had it's mass effectively reduced and then it is accelerated at the "cost" of the accelerating the lower mass projectile. When the projectile leaves the Mass Effect field, it reverts to the full mass at the same velocity. It doesn't magically slow down.
What becomes the interesting question is whether the 'mass effect' is naturally or artificially generated (as in can it extend into toher universes, at least if people are going to extend it into a crossover like this.) If its artificial (EG someone created the 'field' to cover the galaxy, not unlike the tachyonic 'solar sails' made up for Dooku's sailer in AOTC, or the webway/AStronomican in 40K) it would have to be replicated there for (some) of the effects to carry over.