General theory of relativity (written in Junior High School)

You can see two cars driving on the road at the same fast speed. You must say the two cars are running really fast. If you do not think so, you do not need to continue reading it. If you think so like me, please continue reading it.
From the perspective of physics, motion is relative. The two vehicles are moving at the same speed. If they are referenced by each other, they are relatively static. That is, the speed is 0, let alone the speed is not fast. However, if we take ourselves as the reference objects, they become fast-moving. Because we are used to taking ourselves as a reference object, people will say that cars run fast.
Maybe you have to ask: "Why are we used to taking ourselves as a reference ?" The reason is simple. At that time, we looked at things with our eyes, not our feet. Because our eyes grew on our own bodies, not on the car. So you will regard yourself as a reference. Of course, if you say that you are watching things with your feet, you can also talk about it. Because your feet grow on you, not on the car.
Maybe you have to say, "If our feet or eyes are on the car, can we use the car as a reference ?" Yes, but here we only use another method, that is, to climb to the car. As for how to make part of your body grow into a car, you need to explore.
Maybe you think the above example is boring. Please refer to the following example.
There are two ugly people, A and B. You can see them. You will say they are ugly. Do you think they are all beautiful ??? Hey, here you should have a deeper understanding of why I 've been talking about a lot of things! But if you take a closer look, you will find that A is more ugly than B. Do you think B is beautiful? Certainly not. Do you think B is more beautiful than? You said yes, because a is ugly than B, isn't B more beautiful than? You said no, because they are ugly and not beautiful at all. It seems that both methods have their own principles. In fact, the former is objective, while the latter is macro. Why do we often say that what is objective is truth? Because macro-level estimation is often just rough, and the essence of the problem is not realized. So what is the essence of the problem? Put both A and B in a vacuum. Only two of them are compared, so do not compare them with others. In this way, B is more objective than.
After talking so much, do you know how to judge a person's beauty and ugliness? This involves some average points (n. Each person has an average point in his mind to measure the beauty and ugliness. If he sees a's beauty and ugliness below this average point (A <n), he will think a's ugly; otherwise, if we see C> N, we think C is beautiful.
Since everyone sees and hears different things, their hearts are different. If NP <C <NQ, C in the p eye is different from C in the Q eye. P thinks C is beautiful, and Q thinks C is ugly. The formation of N is a long-term result, and because every person is in touch with new things every moment, n is constantly changing.
In this case, everyone's point of view is different. Isn't it impossible to judge a person's beauty or ugliness? This is determined by the social average (NN. Nn indicates the average value of N for all people in the world. C> NN is known, and C is recognized as the beauty of society. Q's point of view is not in line with most people's point of view. It can be said that Q's eyes are poor. Of course, each person has a lot of N in his mind: N is ugly, n is good or bad, n is stupid, and so on.
You may ask, "What if you want to compare two irrelevant items? For example, how can we determine whether a is more stupid or ugly ." In this way, we can't just rely on one person to judge. We need to introduce all the people who have seen a in the society (n ). In N, N1 personally think that A is smarter and more stupid than NX in his mind, while N2 personally think that A is less ugly than NY in his mind. In this case, you only need to compare the sizes of N1 and N2. If N1> N2, it can be said that "although a is ugly, A is more stupid than her", and vice versa.
The above is a simple case of two or three pairs. The following section describes the three-three comparison that is more complex. If a is ugly than B and B is ugly than C, it is easy to know that a is the ugliest. If a is ugly than B, and C is ugly than B, it is hard to judge. In this case, you need to introduce the variable u = B and set U = A to, A = 2u, c = 3u. Because C> A, C is the ugliest. It is also important to select appropriate parameters. If a = (10e10) U, c = (10e11) U, we can see that the variable U is not suitable. If v = a dinosaur = (10e10) U is introduced, the calculation result will be much smaller, so that we can compare it easily. Of course, if a = (10e10) U is known, a can also be considered as a variable.
"The universe is moving with me"
"No absolute, only relative"
"Although a is ugly, her words are ugly"
"Although a's foot stinks, her hand stinks"
After reading this article, do you understand these words?