OK, a Man on a bike - leans into a corner to make a turn. How does he do that? Don't the laws of physics say that it's impossible for him to shift his center of mass from side to side? There's nothing for him to push against (side to side) It's like being up in space. and he shouldn't be able to shift the center of mass, no matter how hard he tries it. If he leans to the right, the bike will lean to the left to compensate, and he can't get round the corner because he simply can't shift the center of mass. (Or so say the laws of motion) Well, we all know it IS possible to ride a bike around a corner, So what's going on ?