Quote Originally Posted by JKDS View Post
How come bicycles stay upright while in motion?
The short answer is that when the top of the bike falls to the right, it turns the front wheel to the right. If the bike is moving fast enough, then it will pull the bottom of the bike to the right such that it's under the top of the bike. Now the bike is upright, but it has rotational inertia which pulls it to the left. So it falls to the left, and that makes the front wheel turn to the left, and yada yada yada.