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In place? No, something changes.

Have you ever lost your attention while watching something rotate? Or have you ever been interested in such things? Probably once in a while. Rather, it might be something strange that you have never thought about. It is natural that you can't take your eyes off something spinning, because sometimes the object that is spinning is not just moving, but it is actually drawing something. Let's talk a little more slowly about this story. What is rotation? Just something turning endlessly? Perhaps that would be the simplest form and the most basic form of rotation. Rotation means that an object is physically spinning around a standard, an axis or point, or spinning to be one with the standard. As you might know you are already part of a rotation process that you can’t control. If it was too close, and too enormous, you might not feel it, but you'll feel the concept of what I’m talking about a little bit if you continue to read this article.

As I said, you are already spinning. On this huge earth. But the earth is spinning, too. Around the sun. The sun and the galaxy including the earth are turning. At this point, you may feel like, "Oh, I'm spinning!" But that's not why I wanted to write this. I would like to say that rotation is a very basic and important exercise. In a space where physics is applied in the natural world, when an object is given energy, its shape is transformed, converted into another energy, or exercised. Rotational motion becomes a form of basic movement with translational motion, and it is an inevitable exercise that occurs in the process of finding the balance between force and energy, one of the important laws of nature. When an object or particle is given energy from the outside, it rotates the center to maintain the force balance. Rotation is basically like uniform motion. In order to rotate, there must be a force perpendicular to the direction of motion of the object, that is, a force directed toward the center. We call this force the centripetal force. Because of this centripetal force, a rotating object can rotate without leaving the orbit. There is always a center or a central axis in a rotating object, where the force is always balanced. There are two main types of rotational motion. The first is that an object or a particle revolves around a central part corresponding to a virtual or real axis or point. It mainly appears in the form of orbiting, and the gravitational force or tension acts as the centripetal force. If you think about the moon turning the earth, your understanding will grow fast. The second is to rotate around the center or axis within the rotating object or particle itself. A force acting in the state where an object or particle is already bonded to the center appears as a rotational motion. The baseballs which a pitcher throws, or flying bullets can be included in this case.

This rotation is a basic exercise, so it can be frequently encountered in everyday life. Let me introduce two examples from each point of view. With the spins that affect us and that we use to affect somewhere. First of all, what affects us the most? There is the biggest and most important spin that you do not feel. It is rotating. The Earth rotates about once a day based on a virtual axis connecting the Antarctic and the Arctic. This rotation creates a place where not only humans but also many life forms on Earth can live. What if this earth stops spinning? The moment it stops, there will be a great deal of trouble. Above all, the speed of rotation is 1600 kilometers per hour when it is based on the equator. As soon as the rotation stops, everything on earth that is affected by inertia will fly out into space at a speed of 1,600 kilometers per hour. The crust itself may be shattered like paper. Even if the speed is slowed down without fully stopping and the rotation stops, the situation that would happen afterwards is terrible. We would not see the sun for six months of the year. For the remaining six months, the night would disappear, and the temperature would rise tremendously. You would have to live in extreme conditions more extreme than the desert. The flow of the atmosphere would stop, the sea and continent would change shape, many creatures would become extinct. There are many other problems. So rotation, this gigantic spin, is the foundation of the most basic and important elements for living.


In this article, I wrote about only two rotations selected to fit my personal criteria, but as I said, rotations exist everywhere in the world. Regardless of whether it is large or small, if there is a force, if matter exists, then if there is a center, it will begin to turn and then it will turn and seek the great balance of the natural world. In fact, there is no end to talking about rotation. Perhaps you will be surprised not only by what I’ve written in this article but also by the enormous quantity of rotations in our life that goes beyond this newspaper article. As a person who marvels about the phenomenon of rotation, I would like to continue to write about rotation more and more. But I do not think there is much space in the article. What I want to talk about most about spin is the hidden power, the life of rotation. The example of rotations mentioned above are divided into two criteria, but it is all one theme in some sense. Life created by rotation, and life- like dynamics granted by spinning. Rotation intervenes in the realm of life beyond simple physical phenomena. The most basic phenomenon creates the most complex form, the overall value. How should we embody the infinite possibilities of rotation as much as the possibilities of life in our future society? The rotation science that we have not found yet can be used to a much greater extent than we thought. Certainly, such a future will be much more dynamic than it is now.

Choi Bugeun  hsy4473@naver.com

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