A simple question that has been bothering me for a long time

Hehe. This question

These are two different types of forces, and the reason why they are called so is because:

Traction (a type of power), resistance is divided according to the effect of force.

Friction (a part of the electrostatic force in the four forces) belongs to the cause of the force.

That is, the reason why these two forces are called differently is simply because of the different reasons that divide them.

They are not necessarily distinguished from the connection.

Friction can be traction or drag.

Traction may or may not be frictional.

But in the model of people and cars, if the model is simplified to the simplest. That is, when a person is only subjected to friction, this friction is also a driving force, but it is not a traction force. Traction is the cause of the intrinsic force generated by power.

That is, what force makes people move, what force is traction. Then the traction force of the person is the internal muscle force produced after the glucose is burned.

In the car model, the rotational force generated by the engine (similar to muscle force) is the traction force.

But we have to note that the muscle force and the wheel power are all backwards, and if people want to move forward, they must have a forward momentum. According to Newton's third law, the driving force is that frictional force.

A person walks on the ground and is subjected to a lot of force, but after the forces cancel each other, they are only subjected to a static frictional force. Think about it, are people not affected by gravity? Obviously, man must suffer, but only by a net frictional force, the traction force, which is an internal force, backwards.

Therefore, people are not only subjected to static friction, but people are subjected to many forces, but they are counteracted, and people are only subjected to one external force of static friction, that is, the combined external force. When people give a traction to the ground, they "give" rather than "receive".

People and cars are the same, but the mechanical transmission part of the car is obvious, we often put forward the concept of traction, and the mechanical component of people is not obvious, so the concept of traction is not used.

The traction of the car is done by the engine driving the wheels to rotate to the ground, not directly to move the car forward.

The force that moves the car forward is still the static friction of the ground.

Just for the sake of simplicity, let's say that traction does the work to make the car move forward.

People and cars, like people, do their own work on the ground, and then the ground reacts to people or cars, and the car does not directly do work with traction.

The first question I thought of this: root 2 times root 6

It is the root number 12, which is 2 times the root 3

It can be seen as: Root 3

The addition of 3 roots and 3 roots is smaller than 7 roots respectively

Root 5 bar! That's root 7 plus root 5

Less than. Root 2 times root 6

The second question is the equation problem: let.

** x yuan. The equation is: single profit [(40+x)-30] * sales volume (600-10x) = total profit 10,000

Find x and price it at 40+x

The sales volume is 600-10x

1. First of all, you have to figure out what the nature of the entanglement is, why do you dare not make decisions and choices about many things? In fact, most of them have this problem, and the main reason for such a problem is that they are afraid to take responsibility, why do you say that? Because the entanglement is that you don't want to decide to do something, or you don't know what is right to do, it's because you're afraid that you'll choose, or when you decide to do something, you're afraid that you'll go the wrong way and make the wrong choice, and you don't want to regret it or other people's complaints.

2. In fact, in life, no one can attribute their own destiny, life is inherently uncertain, if it is all determined, it is equivalent to a spoiler life, what fun is there? Therefore, there is no need to be entangled in things, what should be done, and the choice that should be chosen, as long as it is an ordinary normal person, there is no choice that you can't bear the responsibility for.

3. From another point of view, although life is indispensable, each of your scattered choices will not have any impact on life, no matter what school you choose to go to or who you marry, the general trend of life will not change. Because no matter how you choose, the road of life will eventually develop in a certain direction, and life is ultimately determined by people's congenital factors and growth environment, as well as the outlook on life, world view, and values formed by ordinary experience.

4. In short, there is no need to be entangled in life.

No one has no lungs and no one is entangled in the slightest. What has been experienced, what experience and lessons have been learned, are all gains. The successful experience of others must not be copied by others, but the lessons of their failures can be used for reference.

Optimistically. Make more friends and experience more things. Effort pays off.

Let's say the pencil's ** is x. Then the ** outside of this is x+1, because it is a total of meta, so x+(x+1)=so x=

That's right, two add up to 1, and 1 plus equals.

Practical reasons: there are many Chinese, and proportionally speaking, there are more people without quality.

Historical reasons: Since the end of the Qing Dynasty, China's original relatively stable social structure has been impacted, and the spiritual inability in the process of re-exploration can be imagined. Foreign insults, civil wars, and the Cultural Revolution have all exacerbated the chaos in the spiritual world of the Chinese. It will also be better after the social transition to a period of stability.

Political reasons: Not every demand in China can be satisfied, and it is natural for suppressed demands to turn into swearing.

Economic reasons: Everything is looking at money, which is a contributing factor that leads to spiritual emptiness and low-end competition.

Cultural reasons: The Chinese nation is a nation that attaches great importance to etiquette and religion, and there are rules and regulations in all aspects, and once the original rules are destroyed and free individuality is encouraged, under the situation of sudden liberalization, people's laissez-faire will be unscrupulous. In addition, China has been in an agrarian society for a long time, and the way of competition between people is also at the low end, scolding, and low quality are all manifestations of it.

A flash of thought in the financial big is tens of billions of profits, and there is no need to scold people.

International reasons: In the world, Western culture has been in a dominant position for a long time, the west wind is gradually eastward, and when the Chinese are affected by external factors, they have no position, and they are not self-reliant and self-reliant, and the outside things are easy to be haz.

It is not easy to build the quality of citizens in a country with the largest population.

However, the attacks on low quality and the criticism of Hahan Hari have never stopped, and society is advancing precisely in the checks and balances of various forces. Doing what you think is right is your participation in society.

I hope that a little bit of my opinion will solve your problem.

Well, the phenomenon you said has nothing in me, maybe it's because I'm a college student, it doesn't seem to be as serious as you said, it should be more young people in society, they swear I feel very unqualified, I also dislike this kind of behavior, at least there are few such people around me, because once I find such people, I will deliberately alienate them, or go to them, let them restrain themselves, you may not be used to this phenomenon, but you have to face it, Have your own way of treating them, and may you be happy every day......

It's normal, it's not formed in a day or two, and it's not something that can be changed in one or two years, every country has its own shortcomings, it's just that you've lived in China for too long and don't know.

First of all, such experiences are indeed rare. I'll help you with tutoring.

You see that their location is in a remote area, and the other party obviously has a numerical advantage, and evil deeds, and you don't understand the reason, in the case of considering the strength of the comparison and the environment at the time, you didn't make the right choice rashly, but you didn't follow the investigation or call the police, etc., which proves that you were very nervous at the time and completely forgot about these methods. Ordinary people who don't have the relevant knowledge and training will react like this, and you don't have to worry about it, whether you are worried or not, maybe someone passing by saved the woman. You don't have to dwell on it.

It is recommended that if you often pass by such areas, you should learn some relevant knowledge, and when you encounter similar incidents, you can help wittily instead of going to the fire.

Well, you'll be condemned. =