One of the first things we learn/teach in European sword cuts, is not to "swing" the sword. Again this is
European Sword Work, so make sure the idea transfers, but it sounds like what Sukerkin said.
When we cut, whether one-handed or two, the end of the cut always results in being in some sort of guard position, depending on the cut. To get there, imagine snapping a towel at someone -
you don't swing the towel in a large arc - don't swing the sword in a large arc
you throw the towel "out" -- "Throw" the cut "out" (away from you).
when the towel reaches the end of it's length, snap your wrist across, to cause the "snap" -- when the sword reached it's furthest point away from you (remember, you're throwing it "out"), then you "snap" the sword across, causing the "slice" or the "draw".
as Sukerkin described:
Think of it like flicking a length of rope so that the shoulder moves first, then the elbow, then the wrist and finally the fingers grip at the point of greatest extension to stop it flying away.
after you snap the towel, you'll notice that all of the energy has been spent in snapping it, and it will sort of "float" back. -- In the same way, if you throw a cut properly, all of the momentum will have been focused on the cut, and you won't have to "stop" it from following through too hard. It will "want" to stop in the proper place, which is important for us, since we usually follow a cut with a thrust. (A wicked combination).
Again, this is for
European Sword Work, I know nothing about eastern sword work, so make sure that this is appropriate to your style. On the other hand, physics of a sword don't change.
However, I have done Korean Martial arts (My Grandmaster started in Tang Soo Do, as well as my school instructor) This type of thinking also works well for round kicks, ridge hands, hooking palm strikes, chops, and heel kicks. (It even works well for splitting wood with an axe - you'll be amazed at how much more power you can generate.)