Chapter 489

"How heavy can you lift?" Wang Yang asked towards that Zhao Ji.

After Zhao Ji thought about it, he raised a finger. "A hundred catties is no problem, if it is more, I am afraid that it will be difficult."

"That's okay, Qilang, you take two people to get three hundred pounds of steel ingots, and by the way, go and get a big scale." Wang Yang commanded towards Wu Qilang.

Zhao Ji looked at Wang Yang with a confused expression, he really didn't understand what the old driver wanted to do, so he hurriedly stated loudly. "Three hundred pounds? Sir, what are you doing here, even if the younger brother uses the strength to eat, he can lift a weight of up to 150 catties, and no matter how much he does, he really can't do it. ”

"Hehe, why are you in a hurry, can I still put those three hundred catties on you? Then you'll know how good this pulley is doing. For now, I beg my pardon for the time being. ”

After a lot of effort, Wu Qilang and the others came to Wang Yang's office with a hundred catties of steel ingots each carrying a hundred catties of stinky sweat.

In addition, he also brought the big iron hook and scale that Wang Yang needed. Wang Yang first let Wu Qilang stand on top of the desk, nailed the iron hook to the sturdy beam, and then hung a large pulley on it, then brought hemp rope, and then began to pass through the pulley......

Zhao Ji can be described as confused, but the problem is that Wang Yang just didn't tell him, just asked him to wait and see the result. Until all the pulleys are done, a sturdy bamboo basket for steel ingots is hung on the bottom pulley hook.

The 300 catties of steel ingots, although they are very heavy, but their volume is not very large, and after the sturdy bamboo basket is loaded into the 300 catties of steel ingots, there is even room for it.

Wang Yang tilted his head towards Zhao Ji. "How about it, let's try it first, is the weight of the bamboo basket enough for three hundred catties."

"Me?" Zhao Ji pointed to the tip of his nose and looked at Wang Yang in disbelief, his expression was as if he had just been beaten by a dog.

"Your Highness, I just asked you to give it a try, and I didn't say that I had to let you pick it up." Wang Yang encouraged with a smile.

Zhao Ji could only step forward in the end, and then stood in front of the bamboo basket and began to exert himself, okay, Zhao Ji's little face was as red as the monkey's buttocks, but there was no way to lift the bamboo basket.

"No, it's really not good, three hundred catties, there must be three hundred catties, there is absolutely no doubt about this." After trying several times, Zhao Ji, who looked a little out of breath, retreated and held the case and panted.

"Then Your Highness, try to pull this rope again and see if you can lift the three hundred pounds of steel ingots." The smile on Wang Yang's face still looked so mysterious.

"Still playing? No, no, sir, I really can't mention it. Zhao Ji almost wanted to roll his eyes and faint.

"Your Highness, you will definitely do it, just like me, one up, one up, one up, one down...... You see, how simple, how easy, just up and down. Wang Yang continued to smile mysteriously, and then began to pull the rope.

Then, Zhao Ji saw that Wang Yang was actually only pulling the rope that passed through the pulley group with one hand. And the bamboo basket containing 300 catties of steel ingots was so light up and down.

Zhao Ji's eyes were staring at the Big Wild Goose Pagoda in Chang'an. "You, you're going to do tricks?"

"You come and give it a try, you can know if it's a trick, come on, Your Highness, you can do it." Wang Yang beckoned to Zhao Ji.

This time, Zhao Ji was no longer polite, strode to Wang Yang, took the rope, pulled it up, and then saw that the basket almost made himself suffocate just now, but he couldn't mention the bamboo basket, as if it had become only a few dozen catties in weight.

With a little effort, you can see that the three-hundred-pound bamboo basket gradually left the ground and was lifted by itself. Zhao Ji let go with a confused expression. There was a muffled sound, and the bamboo basket slammed into the floor, startling all three people in the room.

Zhao Ji hurriedly apologized embarrassedly, and then went over unbelievably and carried the bamboo basket again, but the bamboo basket was still unwavering. But when he pulled the rope again, the basket rose from the ground again.

"This, isn't this a trick but a demon spell?!" Zhao Ji felt that he was about to lose control of himself. What's the matter, I actually know how to do it?

"No, this is neither a trick nor a demon, but physics." After Wang Yang shook his head slowly, he raised his index finger with a very serious expression and said with great solemnity.

"What the hell is physics?" Zhao Ji looked at Wang Yang with a confused face, and felt more and more that the idols he worshipped seemed to have a halo flickering behind him.

"Physics is the study of the most general laws of the motion of matter and the basic structure of matter. Its theoretical structure makes full use of mathematics as its working language, and experiments as the only criterion for testing the correctness of theories, and it is the most sophisticated natural science discipline today. Wang Yang explained very old driver.

Just like the gray-haired old teacher when he was first introduced to physics in junior high school. "And this pulley set is a practical experience in physics."

"The pulley block is a simple machine assembled by a plurality of movable pulleys and fixed pulleys, which can save effort and change the direction of force. The amount of effort saved by the sheave is determined by the number of rope strands, and its mechanical efficiency is determined by the gravity of the pulled object, the gravity of the movable pulley and the friction. ”

Seeing that Zhao Ji still looked confused, Wang Yang couldn't help but sigh faintly, then walked to the side, took out a book, walked to Zhao Ji and handed it to him.

"The Book of Ink? Does this thing have anything to do with physics? ”

"Take a look for yourself, there is a record of pulleys in this "Book of Ink", and Wang Mou also got inspiration from it, and copied the pulleys that Mozi used at that time."

In 388 B.C., Momo Zhai (known as Mozi) and his disciples wrote a book called the Book of Ink, which contains a record of pulleys.

And it is recorded in detail that the pulley with a fixed central shaft is called a fixed pulley, which is a deformed equal-arm lever, which does not save effort but can change the direction of force.

The pulley that moves with the central shaft and the weight is called the moving pulley, which is a deformed unequal arm lever that can save half of the force but does not change the direction of the force.

In practice, a certain number of movable pulleys and fixed pulleys are often combined into various forms of pulley sets. The pulley block saves effort and can change the direction of the force.

However, since the deposition of the hundred schools of thought and the exclusive respect for Confucianism, many scientific scriptures have gradually disappeared into the dust, because this is the military weapons superintendent, and it is related to the hundred workers, so such books will appear here.