The shock wave can be so powerful that it can knock things over. For example, bombs create shock waves. A shock wave can be destructive because it vibrates the material around the point in an extremely hard and fast wave, which causes other things that the material touches to vibrate too, and even make them explode. Shock waves make bombs more dangerous and sometimes are the most dangerous part of an explosion. However, the shock wave moves much faster than the rest of the bomb's energy, and fades away quickly. It is called a shock "wave", and not simply a shock, because the force goes up and down, like an ocean wave.