My wife is a sword god.

Chapter 171 How can knowledge be measured by money

Among the crowd, Qin Feng talked eloquently: "Do you think that such friction does not exist for stationary objects?"

"Isn't it?" Everyone asked in unison.

Qin Feng waved his fingers: "Wrong, big mistake!
The stillness you see is just the result of friction and other forces canceling each other out!
In fact, this force has always been there! "

"Still in the example just now, it is difficult to push the wine glass on the rough ground because of the coefficient of friction, which causes it to receive a lot of friction, which offsets your pushing force!
However, as long as the pushing force you exert is greater than this frictional force, the cup can still be pushed!
I say so, can you understand? "

Everyone was enlightened, and suddenly realized: "So that's what happened."

Yuan Zhai naturally thought of more than these people: "In other words, sometimes the shape of the wheel I choose cannot carry heavy objects forward because of too much friction.

In this way, the wheels can still only choose similar round objects to reduce friction.

But in this way, the original problem will appear again. When the car is traveling on soft plains or mountains, the wheels are easy to sink into the mud under heavy pressure.”

To build a mobile city, various terrain factors must be taken into consideration.

However, after some coaching, although the elder understood the reason for the failure, he fell into an endless loop again.

Everyone in Shengongfang lowered their heads in thought when they heard the words, and fell into confusion.

"It's not impossible to solve this problem." After a long time, Qin Feng spoke slowly.

Everyone suddenly looked up at him, and the elder also cast a curious look.

Qin Feng didn't say much, but did a comparative experiment.

He led the crowd to a tree planted with flowers, which was full of mud.

He ordered people to find two stones of similar weight, one with a flat bottom and the other with a sharp bottom.

Put two stones on the soil at the same time, the flat stone is stable, while the sharp stone below slowly sinks.

The elders and the others were thoughtful. This phenomenon, which was common in the eyes of everyone in the past, has become somewhat unusual now.

They have never thought carefully about what is the reason behind some things that should appear in life?
Qin Feng smiled and said: "Under the premise of the same weight, the smaller the force-receiving area, the greater the effect of force.

Haven't you thought about it?
Why do most weapons have spiked heads instead of other shapes?
Why is it that one side of a knife has to be sharpened, but people don't use the blunt side when cutting things?
Why can a needle and thread pierce clothes easily, but not the palm of your hand? "

Looking at the expressions of the people who were sometimes thinking and sometimes excited, Qin Feng said solemnly: "It all comes down to the effect of force. I call it pressure."

Then, Qin Feng explained the concept of pressure in the high school physics textbook.

After hearing this, everyone in Shengongfang was stunned for a moment, then lowered their heads to think, and then suddenly became enlightened, and there was an endless stream of praise.

"So it is, so it is!"

"In the past, I only knew what happened, but I didn't know why. Today I benefited a lot from listening to Mr. Qin's words!"

"I suddenly had a very clever idea. If the blunt side of the knife is also forged into a sharp shape, wouldn't the lethality be greatly increased?"

"Didn't you mean the sword?"

"."

Everyone was still immersed in the joy of learning new knowledge, the elder suddenly shouted: "Quiet!"

He looked up at Qin Feng, frowned and said, "The reason why the wheel sinks into the mud is because it bears too much weight, and the force-bearing area of ​​the wheel is too small.

So to solve this problem, there are nothing more than two ideas, either to reduce the weight, or to increase the force-bearing area of ​​the wheel? "

Is the thinking clear? Qin Feng nodded with a smile: "Considering the slipping and rollover problems you mentioned, combined with the theory I mentioned, I can provide the veteran with an improvement direction."

After speaking, Qin Feng picked up a branch and began to draw on the ground.

Everyone gathered around, and when Qin Feng stopped writing, a situation of wheels that had never been seen before appeared before their eyes.

"What kind of wheel is this?" Surprised voices came and went.

"How can this kind of wheel move?" someone questioned.

The pattern on the ground is a crawler wheel!
The elder looked at the caterpillar on the ground with his eyes wide open. He seemed to have grasped something in his mind, but he always felt that something was missing.

Qin Feng listened to the questions from the people around him, kept smiling, and didn't answer.

There are a lot of mechanics concepts involved in the crawler type, so it is not easy to explain.
"A mature craftsman, after knowing the principle, should learn to think for himself." Qin Feng made nonsense and gave an omnipotent answer.

Hearing the words, the whole group of Shengongfang narrowed their eyes and nodded in approval.

They still understand the principle that the master leads in and practice is in the individual.

Even Yang He, who was standing at the side, put on a smile and said, "That's right."

Lan Ningshuang was curious: "Did you understand what my uncle said?"

Of course I don't understand Yang He snorted lightly: "After all, your Wufu's comprehension is still a little bit weaker, the Taoist of Hundred Ghosts and the Taoist of Wen Sheng Tao are cultivating souls together.

This comprehension ability is naturally similar. "

Lan Ningshuang was at a loss for words, Zhang Tiannan glanced sideways, his eyes full of doubts.

"How do you know this knowledge?" The elder asked the doubts in the hearts of everyone present.

Qin Feng glanced at the crowd, smiled and said, "I once had a teacher who taught me a lot of knowledge.

These are one of them.

Of course, what I benefited the most was a truth I learned from my teacher.

Never be bound by the usual rules, learn to break them, only in this way, you can discover a new world that you have never seen before! "

Yes, the teacher's name is High School Physics, People's Education Press.
The old man naturally recognized Qin Feng's implication. He stood up, looked at the other party, and asked, "What other knowledge do you have?"

There is a play!

Qin Feng frowned, and blurted out: "Of course there are many, many!
Why do things fall to the ground instead of flying into the sky?
Why do the fish in the water and their swimming positions always deviate slightly from what we see?
Why do we see thunder before we hear it when it rains?

What is the principle behind these common things!
You guys don't want to know? "

"Think!" Everyone shouted loudly immediately.

They seem to have seen the door to a new world slowly opening.

"But I'm sorry, I can't tell you, after all, I promised the teacher at the beginning that this knowledge cannot be easily passed on.

Otherwise it is breaking the rules.

What I just said about the mysteries of friction and pressure has actually gone beyond.

I can't be wrong again. When speaking, Qin Feng glanced at the elder, who frowned.

The rest of the Shengongfang group scratched their heads anxiously.

This is like in a brothel, the delicate girl is lying on the bed, the man has all his clothes off, and is about to ride a horse, but the girl says sunflower water.

Can only see, not touch.
This can't go up or down, who can stand it?
Huo Yuan asked: "Brother Qin, can't you be more flexible? We are willing to spend money!"

Qin Feng showed displeasure: "How can knowledge be measured by yellow and white things?!"

"This"

Just when everyone was at a loss, the elder who had not said a word sighed: "Later, you bring the materials for forging the knife.

Also, the novelties you mentioned."

"When the time comes, junior, write it down and bring it with you!" Qin Feng said excitedly.

The people in Shengongfang were very surprised that the elder had to make an exception and forge the same weapon twice!
And they looked at Qin Feng again, with weird expressions: "Mr. Qin, isn't this knowledge not easily passed on to the outside world?"

Qin Feng blushed and coughed dryly: "Don't care about these insignificant details."

(End of this chapter)