@king, physics doesn't make much sense XD An object in motion stays in motion until something stops it. (forgetting gravity, friction, etc) It just bugs me that I can't actually see it.... then again... i can't really see electricity either, but I can sure as hell feel it @>@
^ Lol Check, you get random things in science class from time to time ;P
@ Cipher, Hm, I believe this is due to the Law of Conservation of energy, if no energy is transfer through friction of some kind, then it will keep its energy, and if it keeps its energy, then why would it slow down or stop? In a sense it does make sense, but in the physical world, I doubt you find it anywhere else other than Deep Space, maybe to a certain extent Space...
@king, space? Sure. Since there's no friction or gravity unless you come in too close to a planet or something. That makes sense, however, if you hit some space junk and the energy is transferred, is there a law or equation that figures how much energy is transferred based on mass? I mean, if you throw a ball at a wall, it bounces off since the wall isn't going to move. But if i shoot a marble at a marble, usually the marble being shot bounces back.
That's because of momentum and Newton's (First or second Law?) not all energy will be transfer, some will remain and because the object is stationary, it will act as a "wall" the moment the marble hits it, making the first marble bounces back ;D