"Brother! Today we have a physics class! What are you asking?" Su Tian at the table pulled his sleeve, his cheeks flushed, as if it was not Su Lin who made a fool of himself, but him. Diaphragm

Su Lin came back to his senses from the laughter around him, and the beautiful teacher standing on the podium stared at him with a smile, and smiled dotingly:

"Su Lin, today we are in physics class, but I can also tell you that human beings can be defined from various levels such as biology, culture, and spirituality.

Okay, sit down, today we're going to learn F=......."

Su Lin sat down in his seat in a daze, and listened to Su Tian whisper, "Brother, don't doze off, this lesson is very important?"

Su Lin looked at his younger brother blankly, he and Su Tian were not in the same grade.

"Xiaotian, why are you in the same class as me?"

"Brother, you forgot that I skipped a grade!" Su Tian said. Diaphragm

Su Lin recalled it for a while, and suddenly remembered that Su Tian had indeed skipped a grade.

…… But why, it always feels weird.

Su Lin set his eyes on the podium, the beautiful female teacher took elegant steps, drew a standard cube on the blackboard, and then drew a good line of force with the center of gravity of the cube, he looked at the teacher very familiar, but he couldn't remember the teacher's name, but he clearly remembered that the teacher was teaching biology a while ago.

He remembered that the teacher personally taught others the six desires, one is ***, the second is the desire for appearance, the third is the desire for majesty, the four desires for speech, the five desires for fine and slippery, and the desires of six people.

He remembered correctly, obviously the teacher taught biology, but what was the teacher's name?

"Students, what are we going to learn today?"

"Teacher Tian, what we need to learn is the relationship between inertia, acceleration, and force." One student said. Diaphragm

Oh, remember, it's Teacher Tianzun, and he does teach physics. Su Lin straightened his waist and looked at the formula on the blackboard, and the content of last night's preview came to his mind: inertia is the property of keeping an object in a state of rest or a state of uniform linear motion.

"Very good, then Su Lin, you can answer, what is inertia?" Teacher Tianzun asked a gentle question.

Su stood up and repeated the description of inertia that he had memorized in his mind as it was, word for word.

Teacher Tianzun nodded with satisfaction and asked again, "What is the unit of inertia?"

Su Lin stiffened with a smile on his face and froze in his position.

Units of inertia?

Does inertia have units? He doesn't remember that inertia has units, and there is no such content in the textbook. Diaphragm

"Uh...... That one...... The inertia has size. There are no units of inertia. The magnitude of inertia is only related to the mass of the object, it is an intrinsic property of the object itself, it is only related to the mass, and the mass is the measure of inertia." Su Lin quickly searched the pre-study knowledge in his brain, and answered the questions as accurately and detailed as possible.

Teacher Tianzun frowned, "How can inertia have no unit? It seems that Su Lin didn't study well yesterday, so he shouldn't know the formula for calculating inertia?"

"Inertia...... And the formula for calculating inertia?"

The surrounding classmates laughed, Su Lin's cheeks were hot, and the ridiculous gaze of his classmates made him uncomfortable, could it be that in this classroom, he was really the only one who didn't know the formula for calculating inertia?

He cast a look of help at his younger brother, and Su Tian lowered his voice and said, "The unit of inertia is I."

Su Lin hurriedly opened the book and saw that the unit of inertia was indeed I.

But this is not in line with the knowledge of inertia in his memory! Diaphragm

Inertia is an intrinsic property of the object itself, it is only a definition of a property that the object itself exhibits, it should not have a unit, because it does not change, the greater the mass, the greater the inertia! The smaller the mass, the less inertia!

"Mass is a manifestation of the high probability of inertia, and the greater the inertia, the greater the mass; The less inertia, the less mass." Tianzun said.

What is a high probability manifestation? I don't understand, Su Lin's brain is blank.

Celestial Venerable continued, "Now let's imagine that an object will come out after changing its inertia

Now, what kind of thing, like my fist, if I make the inertia of my fist smaller, what will happen?"

"Teacher, I know!" A female student raised her hand, "Teacher's punch speed will be much, much faster!"

Su Lin, who was standing at the penalty station, opened his eyes wide and said in horror, "No! Inertia cannot be changed! Inertia is only related to mass, and if the mass does not change, the inertia does not change!"

"Su Lin, don't make trouble, don't talk until you have a good preview!" The girl stomped her feet. Diaphragm

"Okay, okay, tell me what happened to Su Lin?" Tianzun asked the girl.

"In an environment where the inertia can be changed, you can't use the formula F=, but F=ia, and the teacher's punching speed will become very fast!"

"Good! If I punch so fast, will the power of hitting others change?"

"No! The kinetic energy formula is Ek=^2/2, and even in an environment where inertia can change, kinetic energy is still related to mass and velocity, so kinetic energy does not change!" The girl replied.

At this time, Su Tian raised his hand and spoke: "It will change! Although the mass has not changed, the speed of Heavenly Master's fist has become faster, so the kinetic energy will increase."

"Xiao Tian answered very well! That's it." Tianzun praised.

Su Lin felt that the brain cells were soaring, the neurons were self-harming, he couldn't understand what Teacher Tianzun and Xiao Tian were saying, in his cognition, inertia and quality were actually one. Diaphragm

Units are not required for inertia because in the formulas that require inertia calculations, mass can be completely substituted.

However, Tianzun gently patted Su Lin on the shoulder, asked Su Lin to sit down, and began to talk on the podium by himself: "Now let's turn to page 36, in junior high school, we only learn the manifestation of inertia change at the macro level, and the micro level is not until the university.

In addition, inertia, although it can be changed, does not disappear, just like the conservation of energy, it is a phenomenon that can be transferred from one object to another......

Tianzun carefully expounded the valuable knowledge on the podium, and Su Lin sat in the first row in a daze.

He didn't think it was right...... It shouldn't be like this, if you want to say something wrong, he thinks it's not right!

He had a lot of correct knowledge in his head that he had never learned.

Those knowledge are telling him that the world is not like this, inertia is very important, inertia cannot be changed, and the reason why matter exists and is stable is because of the existence of inertia. Diaphragm

If the object does not have the self-attribute of maintaining a stable state of motion, then the molecules that make up the human body and everything in the world will fly around, the human body will decompose, and the hard iron may be as soft as tofu, and the tofu will be as hard as an alloy...... If inertia can be changed, there will be no more order.

The physics textbook on the desk circled in his eyes, and the vivid examples in it made Su Lin feel that he was reading a book from heaven, everything was logically wrong and full of loopholes, how could these formulas be applied to reality?

It's all wrong.

"Su Lin, I don't listen carefully in class, and I don't study carefully after school! I'll take a look at my office after class and stay after school today."