After that night, calm was restored to the Kyushu Academy of Sciences.

It's winter, but my heart is hot.

'Woo woo' steam whimpered incessantly.

The steam engine, which was improved by the latest technology, was crisscrossing the Kyushu Academy of Sciences, and Li Zhen was sitting in the carriage, not cold at all.

There was a burning flame and a boiler underneath, and it was even a little stuffy.

"The Physics Institute has arrived."

Li Zhen nodded, put the fur hat on his head, and tightened the collar of his clothes. Then he got out of the car with a few books in his arms.

"Qi stunned, you go play first, this class is about an hour. You count the time to come back and pick me up. ”

Qi Zizi nodded: "Go quickly." ”

Li Zhen walked into the auditorium of the Institute of Physics. Qi was stunned but didn't go anywhere, the whole person nested in the steam car and read it carefully with a book in his hand.

Since the establishment of the Kyushu Academy of Sciences, Qi Stunned also felt that it was time for him to become a cultural person. He learns on his own, starting with literacy. I am afraid that I will be seen by others in this high-end school, and I, a follower of Li Zhen, will laugh at myself for learning to read and write. So Qi stunned is secretly learning.

Now I learned the 99 multiplication table......

"Master Li is good."

The auditorium was packed, and all of the more than a hundred seats were full. Sitting in the first row were the first batch of personnel from the Kyushu Institute of Physics, Liu Jinghong and others.

In the back, there were all people who later joined the Kyushu Institute of Physics. Among them, there are those from Fuxing University and even Imperial College. There are also many folk intellectuals.

There weren't enough seats, and many people were sitting in the hallways, sitting on the floor. There were still a lot of people standing behind them.

All of them came to listen to Li Zhen's class.

Everyone cherishes the time of Li Zhen's lectures, even if it is a hundred thousand urgent things, they must come to listen to Li Zhen's lectures.

Li Zhen looked at it, and everyone stood up and saluted him, and there was no anxiety in his heart. Although not all of these people are teenagers, there are also many middle-aged people, as well as a large number of older white-bearded intellectuals.

I've been in class a lot and I'm used to it.

Li Zhen nodded and put the book on the lectern: "Sit down." ”

Flipping through the books he had written and which are currently only circulating within the Kyushu Academy of Sciences, Li Zhen said, "Where did you talk about it last time?" ”

Liu Jinghong stood up and shouted, "It's time to talk about mechanical movement today." ”

A middle-aged man with glasses stood up and shouted, "Why. Today I should talk about electromagnetism. ”

"Mechanical movement."

"The Kyushu Institute of Physics now mainly studies mechanical motion, and electromagnetism will be talked about later."

"Why, we're interested in electromagnetism."

“……”

Li Zhen smiled and pressed his hand: "Now there is a disagreement in the Physics Academy. Some people like to study electricals, and some people want to study mechanics. It's a good thing that everyone has their own areas of interest and expertise. In fact, physics is also a very complex subject, and not all phenomena can be understood by one person. Han Xian. ”

Fang Hanxian stood up: "Master Li? ”

"Han Xian, you are the vice president of the Physics Academy, you can debug it. There should be a branch of the Physics Academy, and let's count what everyone is good at. Categories should be separated. Different majors are set as elective and compulsory. Many people are now interested in electromagnetism, so let's do it, under the jurisdiction of the Kyushu Institute of Physics, a branch of 'electromagnetism' is being established. ”

Fang Hanxian was excited: "Yes." ”

In the auditorium, everyone was in ecstasy. It's good to learn separately. There's so much more to learn.

"Today we're going to talk about the first law of motion."

The first law of motion, the full name should be Newton's first law of motion. But when Li Zhen was compiling the textbook, he suddenly had an agitation, he didn't know who Newton was, as if someone had given this law to him. Speaking of Newton, it seems that he was a great man in ancient times.

But...... I can't remember who told me this. And today, no one has heard of Newton.

Therefore, in the textbook, Li Zhen compiled this scholarship as the "first law of motion" and canceled the name of the person.

"What is the first law of motion?"

Qin Enze sat in the front row, holding a cigarette gun in his mouth, and asked with a hard puff.

Qin Enze smoked a gun in class, but no one said anything about him. Everyone knows Qin Enze's experience, he is a person who has been severely burned and used opium for analgesia.

If you want to say that he didn't develop an addiction during that time, it's impossible. But Qin Enze can now suppress this addiction.

When I got addicted, I went to take a hot bath. In normal times, tobacco leaves are used to replace this feeling of emptiness. Slowly, with an addiction to smoking, he became an old smoker at a young age. The bong barely left his hand.

But no one resented him.

Li Zhen fanned the smoke drifting over with his hand, wrote the words of the first law of motion on the blackboard, and said:

"The first law of motion, also known as the law of inertia, the law of inertia. Any object must remain in uniform linear motion, or at rest, until an external force forces it to change its state of motion. This is the first law of motion. ”

Li Zhen drew a few images on the blackboard and preached endlessly: "To understand the first law, we need to first understand a thing, which is called friction resistance. Everyone understands the frictional resistance, right? The book is now on this lectern, and I'm going to tilt the lectern now, what's going on? ”

A girl hurriedly stood up: "Because the tilt angle is not large enough, and the influence of gravity and gravity is not large enough, the book does not move." Now the book is still. ”

Li Zhen nodded: "It has something to do with these." But the main relationship is that the surface of the book touching the lectern is too large and too large, so the resistance to friction increases. What happens if I add a few round wheels underneath the book? ”

The girl added, "If you add more wheels underneath, the book will slide down with the same tilt angle." ”

"Yes, that's friction. So with friction in mind, let's talk about inertia, as well as inertia. As a ball rolls down the bevel, its velocity increases. Roll up along the slope and its speed will decrease. If the ball rolls along a horizontal plane, its speed will not increase or decrease. But in reality, the ball will slow down and eventually stop. Why is that? ”

The auditorium was engulfed in discussion.

"yes, why is that?"

"Yes, I'm sure I know that, if a ball rolls towards the horizontal, it will eventually stop. But why is that? ”

"Huh...... I didn't think that I couldn't explain why I was a high-level intellectual who couldn't explain the common sense in life. ”

“……”

Someone timidly raised his hand and said, "Because, it has no follow-up motivation?" ”

Li Zhen shook his head, knocked on the blackboard and said, "After excluding the factor of continuous power, if the surface of this ball is smoother, the farther this ball will roll." Why is that? ”

Liu Jinghong suddenly exclaimed: "Then is this friction?" Is it because of friction? But no, the ball rolls forward, and the roll forward is in the form of a wheel, so how can there be friction in the circle? ”

Li Zhen said: "As long as two objects are in contact and in motion, no matter what shape it is, it will have friction. Jing Hong is right, because of friction. When the ball rolls, if the surface is not smooth enough, it will not roll as far as smooth. So it can be inferred from this, if there is no friction, will the ball keep rolling? ”

“……”

“…… The force is not the reason for maintaining the motion of the object, i.e., maintaining the velocity of the object, but precisely the reason for changing the state of motion of the object, i.e., changing the velocity of the object. Therefore, once an object has a certain velocity, if it is not subjected to force, it will move in a straight line at a uniform velocity. ”

“…… And this is inertia, with inertia. ”

“……”

In the 'rustle' auditorium, everyone kept bowing their heads solemnly and making notes in their notebooks.

Li Zhen looked at the time, took the book and left.

The classmates suddenly stood up collectively: "Xie Lishi." ”

After saying that, he continued to sit down and continued to take notes carefully.

After leaving the School of Physics, Li Zhen got on the steam car: "School of Chemistry." ”

A moment later, the car arrived at the Faculty of Chemistry.

Li Zhen walked into the auditorium of the School of Chemistry with chemistry books in his hand, and the auditorium was still crowded......

"Master Li is good."

“……”