In the crowd, Qin Feng talked eloquently: "Do you think that there is no such friction in stationary objects? ”

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

Qin Feng waved his finger: "Wrong, big mistake!"

What you see as stillness is nothing more than the result of friction canceling out other forces!

In fact, this force has always been there! ”

"Again, in the example, the glass is hard to push on rough ground because of the coefficient of friction, which causes it to be subjected to a lot of friction, which cancels out your thrust!

However, as long as you exert more thrust than this friction, the cup can still be pushed!

I say that, do you understand? ”

Everyone was enlightened, and in an instant, their mouths suddenly opened: "So that's what happened." ”

And Yuan Zhai naturally thinks more than these people: "In other words, sometimes the reason why the wheel shape I choose cannot move heavy objects forward is because the friction is too great?

In this way, the wheel can still only choose a round object to reduce friction.

However, this will lead to the original problem, when the car is traveling on relatively soft plains or mountains, the wheels are easy to get stuck in the mud under heavy pressure......"

If you want to build a city that can be moved, you need to take into account various terrain factors.

However, after some pointing, although the patriarch understood the reason for the failure, he fell into an endless loop.

When everyone in the Divine Workshop heard this, they all bowed their heads and pondered, falling into confusion.

"It's not like there's no way to solve it." After a long time, Qin Feng slowly spoke.

Everyone looked up at him suddenly, and the patriarch also cast curious glances.

Qin Feng didn't say anything, but did a comparative test.

He led the group to a tree where flowers were planted, and it was covered with dirt.

He ordered two stones of similar weight, one flat and the other sharp.

The two stones were placed on the dirt at the same time, the flat stone was steady, while the sharp stone below slowly sank.

The patriarch and others were thoughtful, this phenomenon, which used to be taken for granted in the eyes of everyone, has now become a little unusual.

They have never thought carefully about what is the reason behind some things that should happen in life?

Qin Feng smiled and said: "Under the premise of the same weight, the smaller the force area, the greater the effect of the force.

Haven't you thought about it?

Why do all weapons have spiky heads instead of other shapes?

Why is it that the side of the knife is sharpened, and when cutting something, people don't use the blunt side?

Why is it that needles and threads can easily pierce clothes, but not the palms of hands?

Why is an 80-year-old lady ...... Uh-huh. ”

I almost said that I missed my mouth again, and I was mistaken by approaching science...... Qin Feng's face was a little embarrassed: "It all comes down to the effect of force, which I call pressure." ”

Everyone in the Divine Workshop was stunned for a moment, then lowered their heads to think, and then suddenly opened up, and the admiration was endless. Please download the latest content of the app

"I see, I see!"

"In the past, I only knew what it was, but I didn't know why, but today I benefited greatly from listening to Qin Gongzi's words!"

"I suddenly had a brilliant idea, if the blunt side of the knife was also forged into a sharp shape, wouldn't the lethality be greatly increased?"

"Aren't you talking about a sword?"

“......”

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

He looked up at Qin Feng and frowned, "The wheels will sink into the mud because the weight is too great, and the force area of the wheels is too small.

So to solve this problem, there are only two ideas, either to reduce the weight, or to increase the force area of the wheel? ”

Is your thinking clear...... Qin Feng smiled and nodded.

The patriarch then said in a deep voice: "But the friction you mentioned earlier is also affected by the contact area, if I make the wheel larger."

Will it cause too much friction for the car to move forward? ”

"No, it won't."

"Why?"

Qin Feng kept a smile and did not answer.

This involves the concept of sliding friction and rolling friction, which is not easy to explain......

"A mature craftsman, after knowing the principle, should learn to think for himself." Qin Feng was talking nonsense and gave an almighty answer.

When the group heard this, their eyes narrowed slightly, and they nodded approvingly.

The master led the way into the door, and the practice was in the personal truth, and they still understood.

Even Yang He, who was standing on the side, pretended to 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: "Your martial arts' comprehension is still a little worse in the end, and the Hundred Ghost Daoists and the Wen Shengdao are cultivating the Divine Soul."

This ability to understand is naturally similar. ”

Lan Ningshuang was speechless, Zhang Tiannan glanced at it obliquely, his eyes full of doubts.

"How did you know this?" The patriarch asked the doubts in the hearts of everyone present.

Qin Feng glanced at everyone and said with a smile: "I once had a teacher who taught a lot of knowledge.

These are one of them.

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

Never be bound by the rules, learn to break them, and only then will you discover new worlds that you have never seen before! ”

Yes, the teacher's name is High School Physics, People's Education Press......

The patriarch naturally heard Qin Feng's words, he stood up, glanced at the other party, and asked, "What other knowledge do you have?" ”

There's a play!

Qin Feng raised his eyebrows and blurted out: "Then there are naturally many, many more!"

Why do things fall to the ground instead of flying into the sky?

Why are the fish in the water and the places where they swim always be a little different from what we see?

On a rainy day, why do we see thunder before we hear it?

What is the principle behind these common things?

Don't you want to know? ”

"Yes!" The crowd immediately shouted loudly.

It was as if they saw the door to a new world, slowly opening.

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

Otherwise, it's a broken rule.

I just talked about the mystery of friction and pressure, but in fact, it has gone beyond the limit.

I can't be wrong again and again. As he spoke, Qin Feng glanced at the elder, who frowned.

And the rest of the people in the God Workshop were so anxious that they scratched their ears and cheeks.

It's like in the green building, the delicate girl is lying on the bed, the man's clothes are all off, and she is about to gallop on a horse, but the girl says that she has come to Kwai Shui.

You can only see, not touch.....

Who can stand this?

Huoyuan asked, "Brother Qin, can't you be accommodating?" We're willing to spend money! ”

Qin Feng's face was displeased: "How can knowledge be measured by yellow and white things?!" ”

"This ......"

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

And the new stuff you're talking about......"

"When the juniors arrive, write them down and bring them together!" Qin Feng said excitedly.

The group of Shengong Workshop were greatly surprised that the patriarch wanted to make an exception and forge the same weapon twice!

And they looked at Qin Feng again, with strange expressions: "Young Master Qin, isn't this knowledge not easy to pass on?" ”

Qin Feng's face turned red, and he coughed dryly: "Don't care about these insignificant details......"