ok so your using logic bricks, what exactly is the goal? are you trying to create some kind of simulation?
anyway im not sure if you can do this without some coding, you have to compare relative vectors of movement to be able to set the appropriate motion on an object, i dont think there are any logic bricks for getting parameters of other objects.
you should be able to do this using a property that holds updated motion vector with very little code, im not particularly experienced at python so i wont try to tell you how, im sure there are tutorials on such things around thoguh try the tutorial index or check some linked sites.
if you can tell me a little more specifically what your after i might be able to suggest something specific.