Time passed little by little, Li Chengqian still stood like a sculpture, and he didn't blink his eyes for nearly half an hour, and people who didn't know would even think that he had fallen asleep or had been immobilized.

And Li Chengqian didn't move, and the people around him naturally wouldn't move, but the anxious look in their eyes became heavier and heavier, and even the Tang Dynasty's 'wise demons' had to think about it for such a long time, which showed how serious the difficulties they were facing.

Even the flame of hope that Xiao Tang rekindled has begun to extinguish, and he is already prepared in his heart that Li Chengqian has no way to do it.

Just when the flame of hope in everyone's hearts became more and more likely, Li Chengqian, who had been standing still, suddenly slammed his fists and palms, and "snapped": "I understand, I finally understand!" ”

"Oops!" "Your Highness, be careful."

Although he didn't know what Li Chengqian had figured out, looking at his body falling straight to the ground, Night Charm walked to his side and held him up.

"Hehe, I'm sorry, my leg is numb!" Li Chengqian, who almost fell, stood up straight with the help of Ye Mei, although he said that he was embarrassed, but his face was full of excitement.

"Gao Ming, what do you think? Hurry up! After all, Tang Shanzhi had an unusual relationship with Li Chengqian, and he couldn't help the restlessness in his heart, and urged repeatedly.

"Do you know 'inertia'?" Li Chengqian smiled mysteriously, his eyes swept over everyone around him, including Gong Yihan, and said a word that puzzled everyone.

"Inertia? What is that? "It was still Xiao Tang who answered, but the fifth son of the Tang family, who thought he was well-read, couldn't remember where the word 'inertia' came from and what it had to do with the train.

"It's simple." Looking at the countless pairs of confused eyes around him, Li Chengqian's vanity was greatly satisfied, and he snapped his fingers and said, "When you are running at the fastest speed, if you are asked to stop suddenly, can you do it?" ”

"This ......" most people hesitated, recalling the scene when they were running, and shook their heads one after another, saying that they couldn't do it.

"Yes!" Just as Li Chengqian was about to continue, Xiaobai's voice suddenly sounded. Then a white shadow rushed out at a very fast speed, and stopped abruptly before everyone could react.

It's impossible, it's completely against the laws of physics, it's a slap in the face! Li Chengqian looked at Xiaobai embarrassedly, feeling that he couldn't cry or laugh, and only glared at Xiaobai for a while: "You are the exception, we are talking about the majority, understand!" ”

"Yes!" Bai Yuening also felt that something was wrong with the situation at this time, as if her behavior was a little reckless just now, she twitched the corner of her mouth and retreated to Ye Mei's side, no, she hid behind her.

Li Chengqian didn't have much to do with this sweet voice and a little greasy girl, glared at her warningly again, and then said, "Let's change the example now." How many of you have lost a stone when you were young? Lost a tool to a companion at work? Raise your hand if you've had this experience. ”

"Whoa," almost everyone raised their hands.

"So why do stones or tools continue to fly in the air after they leave our hands? Why didn't it fall? ”

Everyone shook their heads and looked at Li Chengqian with strange eyes.

In the eyes of these people, it seems that only a boring person like Li Chengqian would consider this issue.

"I can tell you, it's because of inertia." Li Chengqian paced a few steps on the ground, as if he was speaking: "Now that we know what inertia is, then let's move on to the next step, can anyone tell me that if you want to split a piece of wood, is it easier to put an axe on the wood and press it hard, or it is easier to lift the axe and chop it down hard?" ”

"Of course it's easy to cut down."

Most of the people present were craftsmen, and many people knew this truth, and even if they didn't know, they had experience chopping firewood at home, so they answered very quickly.

"Very well, so have you ever thought about applying the problem of inertia to trains?" Li Chengqian's topic changed very quickly, and before everyone could react to why the issue of chopping wood was mentioned, he had already pulled the topic back to the train.

But he can do that, others can.

The reason why Li Chengqian was able to change the topic so quickly was because he had the knowledge and insight of later generations, but the people present did not have this kind of knowledge, and in any case, they could not imagine what kind of relationship would have between splitting wood and trains.

Comrade Xiao Li waited for a long time and did not see anyone answer, and he also realized that he seemed to be in too much of a hurry, so he coughed lightly and said slowly: "I don't know if you have noticed, these carriages are connected by strong cast iron rods. ”

"These cars are designed to be very heavy and can easily break apart if they are not connected with cast iron." The old man is the most qualified person to answer the question, and it is normal for him to answer Li Chengqian.

"But have you ever thought about it, such a connection method is equivalent to connecting the twelve carriages to the front of the locomotive as a whole, if you add the goods, how much weight will it reach? How much force does it take to get it moving? Li Chengqian asked rhetorically.

No one answered, everyone fell silent, no one had thought about this question before, and now as soon as Li Chengqian said it, everyone was stunned.

"So, what then? Gao Ming, if you don't connect in this way, there is no soft material that can withstand such a large pull, and if you want the train to be able to withstand the pull, this is the only way. "Tang Shanzhi doesn't care about anything in the Research Agency, he still knows about some key issues.

"Simple, leave a gap, don't fix both ends in place." Li Chengqian led everyone all the way forward to a connection point: "The connecting rod here should be made into the shape of a ring at both ends, and a fixed column should be installed on the carriage, and the connecting rod should be put into it when the time comes, so that we can easily adjust the function and number of sections of the carriage at any time." ”

"Make these into events?" The old man hesitated to grope on the cast iron connecting rod, as if considering the feasibility of this plan.

"Yes, it should be made active, and the two rings should be made larger, and it is better to leave a certain gap." Li Chengqian nodded and said with great certainty.

"Why is that? Why leave a gap? Doesn't that make an impact? What if the force is too strong and the connecting rod breaks? Xiao Tang asked with a worried look on his face.

(End of chapter)