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"Vector?"

Sun Yuanhua twisted his beard and fell into deep thought, his slightly squinted eyes filled with a thirst for new knowledge.

As the discussion deepened, the topic of the two had shifted from geometry to physics, and it was obvious that Sun Yuanhua, who was an artillery expert, was immediately addicted to it, so when Chu Fan threw out Newton's three laws, Sun Yuanhua couldn't extricate himself.

"Yes, there is both a force of magnitude and direction." Chu Fan began to explain to Sun Yuanhua the basic concept of velocity, and it was really a pleasure to be able to teach scientists in the late Ming Dynasty.

"It's not difficult to understand the old man, but it's just that this direction is ...... But what's the use? Sun Yuanhua's brows soothed slightly.

Chu Fan thought about it, asked Sun Yuanhua to stretch out his finger, and he also stretched out one, and pushed the wine glass on the table from different angles, and the two worked together to push the wine glass in the third direction.

"Force has a direction, so it can be synthesized," Chu Fan paused and said, "Of course, it can also be decomposed." ”

Immediately afterwards, Chu Fan told the fable of the animals pulling the cart again, and finally gave Sun Yuanhua a preliminary understanding of vectors.

Solving the problem of vectors, Sun Yuanhua, who has been immersed in Western studies for decades, quickly had an intuitive understanding of the three laws, and after confirming each other with his old business, he suddenly realized, "In this way, the smoother the gun breech, the smaller the friction and the smaller the thrust loss of the projectile?" ”

Chu Fan arched his hand and said, "That's exactly the reason." ”

The two of them chatted happily, but Sidsha and Liu Zhongwen on the side had already heard stupidly, and at this moment Sidsha finally had a chance to interject, "I said, why did those craftsmen work so hard to polish the cannon chamber?" It turns out that it was because of this. ”

After speaking, he stared at the wine-stained "F", "m", "v" and other symbols on the table and asked curiously, "Young Master Chu, looking at these Latin characters you wrote, it seems that these laws were written by my Taixi?" Why haven't I seen it? ”

Seeing that Sun Yuanhua was also looking at him with a puzzled expression, Chu Fan smiled slightly and said, "This is what the student saw in an English book, and the author's name is Isaac Newton. ”

Chu Fan remembered that Newton was born in this century, and as for being born now, he didn't care if he didn't have it, anyway, he wasn't afraid of revealing his stuff -- in this era, there was no Internet and mobile phones, and he wasn't afraid of Sidesa to check it.

Sun Yuanhua and Sidsha glanced at each other and sighed, "I heard that England is a wild land of Taixi, and there are actually such great sages? …… We are lonely and unheard. ”

Suddenly, he remembered another question and asked Chu Fan, his attitude was as respectful as that of a student, "Young Master Chu, there is still something unclear below...... According to what you said, after this projectile is discharged, there should be no friction to control it, why not fly to the end, but fall halfway? ”

Chu Fan couldn't help but secretly praise Sun Yuanhua, sure enough, he was a scientist, and he asked about the idea as soon as he opened his mouth.

So he threw out the law of gravitation again, but the formula was too complicated, so Chu Fan just explained it in simple terms, and finally said, "It is precisely because of gravity that although we live on the earth, no matter where we are, we can feel that our heads are above and our feet are below." ”

Sun Yuanhua was still ignorant when he explained this, but Sidesa slapped his thigh and said, "Chu Gongzi's explanation can be regarded as solving a big doubt for me...... When I heard that Magellan had sailed west and eventually returned to Seville, proving that the earth was spherical, I had always wondered if a person on a ball could stand upright, but wouldn't everything under the ball fall? …… After listening to Mr. Chu's words today, I know the reason! Come, I'll give a cup to Young Master Chu. ”

After Chu Fan smiled and had a drink with Sidesha, he saw Liu Zhongwen's eyes wide-eyed, looked at Sidesa and asked, "What did you say?" Is the earth a ball? ”

Sidley smirked, "That's nature! I think before Magellan sailed to the west, everyone was like you, thinking he was crazy......"

Sidsha then told Liu Zhongwen in detail about the anecdote of Magellan's voyage, but Chu Fan was not interested in listening, and then explained to Sun Yuanhua, "It is precisely because of this gravitational force that after the projectile is discharged, it will go all the way down and finally land. ”

Sun Yuanhua has been corroborating what Chu Fan said with his own artillery research, although there are still many incomprehensible points, but the general direction is already clear, and he happily raised his glass to Chu Fan and said, "Listening to your words is better than reading for ten years!" …… In the future, the artillery pouring and polishing, the setting of the Wangshan and even the range of the projectile can be calculated, which is really the blessing of my great Ming Machine! …… The old man is not talented, I would like to congratulate you with this cup as a cannon! Congratulations to Daming! Congratulations to Childe! ”

Chu Fan hurriedly said humbly, and also raised his glass accordingly, but his heart was full of joy and pride.

He put out these artillery-related knowledge and discernment, on the one hand, to attract Sun Yuanhua's attention and appreciation, and on the other hand, there is also the intention of helping the development of Daming artillery.

After all, although he already felt that the Ming Dynasty was hopeless, it was natural and obligatory for Chu Fan to be able to do his part for his own nation and his compatriots.

After putting down the wine glass, Sun Yuanhua looked at Chu Fan and was silent, not knowing what he was thinking.

Chu Fan was a little embarrassed by him, and wanted to say that it was possible for the old man to see something strange?

"Does Childe have a word?" Unexpectedly, Sun Yuanhua pondered for a long time, and actually came to such a sentence.

Chu Fan couldn't help but laugh dumbly, it seemed that the head of the military department had a good impression of him, and he was ready to choose a word for himself - in this era, choosing a word for the younger generation is a very intimate expression, and the person who takes the word is generally the elder with the highest prestige and the best knowledge among the clan or teachers.

Originally, he was just looking forward to leaving a good impression on the future governor, but who knew that after a conversation, the other party would actually give him a word, Chu Fan could not suppress his excitement, and said in a trembling voice, "If there is no word yet, I beg the lord to give the word." ”

Sun Yuanhua smiled and said, "It is a great fortune for an old man to be able to be a son." Then he said in a deep voice, "Mortal, the most inclusive, the son deserves his name...... However, the son has a splendid chest, how can it be summed up in one word? …… The old man's meaning, how about the son's table name might as well be called Yixian? ”

Yatsen? Sun Yat-sen?

Chu Fan almost didn't laugh, why did the old man actually put Sun Yat-sen's words on his head, and after Sun Yuanhua dipped in wine and wrote the word "Yixian" on the table, Chu Fan knew that he was making himself amorous, and thanked Sun Yuanhua with a red face.

"Yixian, the old man has been obsessed with Western studies all his life...... My Middle-earth sacred studies are really the best choice for the education of people's hearts, while Western studies are more proficient in craftsmanship and are of great benefit to people's birthdays...... If we can introduce Western learning into sacred learning and make it melt, then our sacred learning will surely be carried forward and will be born...... It's a pity that my generation has tried their best, but because of their advanced age, it is not enough to introduce Western learning into sacred learning...... Looking at the younger generations, Yixian can be said to be the first person in Western learning! …… The old man is not presumptuous, and he wants to discuss with Yixian about something. Sun Yuanhua sighed for a long time, looked at Chu Fan with blazing eyes and said.

When Chu Fan heard him praise himself as "the first person to learn from the West", he couldn't help but have a kind of domineering, and when he heard him say that he wanted to discuss something, his heart beat a drum again.

What is this going on, old man?