When riding a horse the suddenly stops and you fly over its head Why does this happen in physics?

When a horse suddenly stops while you are riding it, you fly over its head because of inertia. Inertia is the tendency of an object to resist any change in its state of motion. When the horse stops, your body wants to keep moving forward at the same speed. However, since your body is connected to the horse, you are forced to stop as well. This sudden stop causes your body to be flung forward over the horse's head.