
In physics, momentum = mass x velocity. But momentum is a vector force, it has a direction. In martial arts, an opponent’s punch, kick, or lunge can be easily redirected by applying very little force to the side of the oncoming attack, thus easily deflecting the attack. The attack loses none of its momentum — only the direction of the vector direction with a timely tap.
Strong opponents are often fooled by their strength and deceived by their momentum. Likewise, we often drive our cars naively, looking only forward, not expecting anything from the side, and are deceived by our massive momentum. We feel the power of our heavy cars moving forward and forget that the vectorial component of our momentum is easily changed. For all it takes is a slight bump from the side and a heavy car can spin and flip, with its unchanged momentum causing its destruction.
In our lives, too, we are sometimes deluded by our blind expectations and the power of our efforts. We forget that a small bump from unforeseen circumstances can send our best intentions into a spin.
We should always beware of the deceit of our own momentum. We need to be aware of our blind spots, to look around us, lest our momentum spin out of control.