The "skids/landing rails" of the helicopters don't act within even somewhat reasonable physics.  The skids act like breaks/glue/magnets almost, though they should not.  you cannot scoot to a stop, even from a moderate speed skid landing eg 15km/hr the hele stops harshly and immediately.  
    The skids also have super grip.. i managed to land on a radar dome, on the side of a radar dome.  Nuff said right, i included a link to a pic of that.