Transmigrated into a female county magistrate during a famine, leading her country to prosperity

Chapter 550 Physics Class: Lever Balance Conditions

General Qiao set his sights on the axle under Shen Zheng's command.

"Okay!" He rolled his eyes and started to show off his cleverness. "I'll tell you, old man, why is Lord Shen always touching the shaft? I guess the trick is here!"

Shen Zheng laughed and did not deny it: "After hinting at it for so long, someone finally 'saw' it."

"Axis!" Liang Fu was not a stupid person. He was just blinded by a single leaf before. Now he understood everything at once: "It is this axis! Whether the well pulley saves effort or not is closely related to it!"

He stepped forward, bent over, and examined the shaft carefully.

Old Qiao blew his beard and snorted, "Old Liang, I was the first to see it this time."

So many people have testified, let’s see how Lao Liang can deny it this time!

Liang Fu said "ah" casually, and it was obvious that he was not interested in competing with him for the first place, which made Old Qiao very bored. He had no choice but to bend down and take a closer look with him.

"Old Qiao..." Liang Fu called out.

"Ok?"

"This trick should not only be in the axis." Liang Fu said seriously.

More than just axles?

Many people present looked at Shen Zheng, who smiled back at them: "Guess with Lord Liang?"

Everyone shook their heads in unison.

With Lord Shen and Lord Liang as examples, how dare they show off casually?

But it is undeniable that they are really curious.

This kind of magical thing that can be discovered in daily life, with Lord Shen leading them to slowly appreciate it, this feeling is really...it can't be better!

To put it in a broader sense, it is the feeling that "everything in the world is in my hands"!

Liang Fu held the handle and turned the axis a few more times, his eyes becoming brighter.

"I understand!" he suddenly shouted.

The old man Qiao, who was closest to him, was shocked and quickly covered his ears. "What do you understand? Do you understand?"

How could this person understand so quickly? He must have fallen behind again!

Liang Fu looked excited and looked at Shen Zheng for confirmation: "Just as Lord Shen said, this well pulley is undoubtedly labor-intensive. And its 'force', in my opinion, is composed of two parts, one in and one out."

In the absence of a suitable term, his understanding was correct, and Shen Zheng nodded in agreement.

Liang Fu got her approval and his speech became smoother: "Everyone, please look——"

As he spoke, he began to crank the handle.

"I shake the handle to make the rope hanging the bucket move up and down, and this 'force' is transmitted to the handle by my hand. This is what I call 'force'."

Everyone nodded, they all knew this.

"Then -" Liang Fu pointed to the shaft, "the shaft connected to the handle, received the force used by me, and began to work, pulling up the bucket. This is what I call 'export'."

this......

Everyone was puzzled. They all knew this? Did Lord Liang understand it?

Only Shen Zheng looked at Liang Fu with a smile, motioning him to continue.

Liang Fu nodded to her and said seriously: "The trick lies in the handle and the shaft. If you want to save effort, you have to convert one part of 'input force' into two, three, or even five parts of 'output force'. In this way, we only need to use 50% or even 20% of the weight of a bucket of water to lift it."

After saying that, he frowned again: "As for how to achieve it, I haven't figured it out yet, let me think about it again..."

There was a sudden murmur all around.

In the end, you haven't figured it out yet, have you? You just frightened them.

"Lord Liang's direction is correct. Is it hard to understand?" Shen Zheng asked them with a smile.

Everyone nodded almost at the same time.

"Let me give you a very simple example." Shen Zheng picked up the hoe next to him. "I'm sure many people have used hoes before, right? Who can tell me where is the best place to grab when digging to save effort?"

As she spoke, she grabbed the middle of the hoe handle, "Here?"

He grabbed the end of the hoe handle again, "Here?"

Finally, he grabbed the hoe handle closest to the blade. "Or here?"

With that said, the result is of course obvious!

"The tail!" Everyone answered in unison, "The higher you grab, the less effort you'll have!"

"That's right." Shen Zheng grabbed the hoe blade and asked, "Then do you know why? This is also a science of 'mechanics'."

"what--"

Everyone scratched their heads and looked at each other.

Yes.

The concept that "the tail of the hoe saves the most effort" has long been deeply rooted in their minds and has become commonplace.

But why is the tail the most labor-saving? They haven't really thought about it carefully.

As for why the hoe and the windlass were mentioned together, everyone subconsciously ignored it.

Shen Zheng picked up the hoe with one hand and looked at them: "Maybe we can give this mechanics a name."

Everyone became more confused by what she said, and subconsciously asked, "What should we name it?"

The invisible and intangible "force" is not a tool, but it can actually have its own name!

"The handle of the hoe is the pole." Shen Zheng turned his wrist and raised the hoe up and down. "Wherever I hold the pole is the fulcrum of the pole, because this is the point where I touch it and use force to lift it. The hoe blade at the other end is one of the forces on the pole, a downward force."

Having said that, Shen Zheng stopped talking.

Sure enough, there are many smart people around her.

A female craftsman apprentice took two steps forward with a bit of hesitation, took a deep breath and said, "Master Shen. I think the force you use is another upward force on the pole, counteracting the downward force of the hoe blade. This... is very similar to a seesaw, both sides are seeking a balancing force."

Seesaw is something most children in the village played with when they were young.

No special tools are needed, just an old tree trunk stuck on a stone. A stone in the middle below supports the tree trunk, and two children on the tree trunk are playing happily.

This was the only thought in her mind, and whether it was right or wrong, she wanted to say it.

Even if she was wrong, she was not afraid of being laughed at.

"That's right!" Shen Zheng held the hoe and clapped his hands with difficulty, "You are right. So the name of this knowledge is..."

"It's called seesaw mechanics?" Liang Fu asked, looking hesitant.

What a random name.

"...Of course not." Shen Zheng was interrupted and didn't know whether to laugh or cry. "Since it is a force seeking balance, we should give it a rather elegant and appropriate name."

"what is it call?"

"It's called..." Shen Zheng smiled: "The lever balance condition force is also called the lever principle."

"In fact, there is another tool that works in the same principle. This tool is also quite common, but it is more complicated. But we used it during the autumn harvest. Can you guess... what it is?"

What is it?

Everyone looked at each other for a moment, and when they thought of the autumn harvest and levers, an object naturally emerged in their minds.