Calculation of internal force by friction

1.

The price of cryptocurrency bitcoin has continued to rise sharply since the beginning of this year, driven by sufficient liquidity in the global capital market, investors' keen pursuit of risk and corporate and institutional investors' starting to buy. Market analysts believe that bitcoin's surprising rise challenges people's imagination and may indicate abnormal risks in global financial markets

the value of bitcoin will grow by more than 415 billion US dollars in 2021, reaching more than 1 trillion US dollars. In the past six months, bitcoin prices have risen by about 350%. Market participants said that recently, some institutions and large companies said they would enter the field of digital currency, which pushed up the price of bitcoin. Changes in the flow of speculative funds benefiting from the early stage in the future and the attitude of regulators may have an impact on its trend. At the same time, it makes more cryptocurrencies known, but the value of most cryptocurrencies, especially bitcoin, fluctuates every day. Although virtual currency is designed to promote safer transactions, it is not difficult to see that its value is becoming more and more speculative through the recent price fluctuation of bitcoin. Some encryption investors become millionaires overnight, but they may lose most of their wealth in a few weeks. It also shows the huge and unreliable nature of bitcoin, especially the goods and services as a currency

potential problems and risks faced by bitcoin

technological innovation: first of all, the challenge bitcoin will face is technological innovation. While the decentralized design of bitcoin makes us refreshing, it also limits the development of bitcoin. Every upgrade of bitcoin protocol needs to reach a consensus with each node on the network, but everyone has different views on bitcoin, and consensus is often difficult to achieve. This problem leads to the bifurcations of bitcoin and the slow development of bitcoin protocol itself. At the same time, with the development of science and technology, the implementation and application of quantum computing will also break the security model built by bitcoin based on the overall computing power of all nodes in the network, which may theoretically achieve 51% computing power attack. So far, this problem has not been solved. In other words, bitcoin may suddenly become less secure after the advent of quantum computing technology. In addition, e to the consensus mechanism of bitcoin, power consumption and hardware requirements are also increasing. So far, these problems have not been completely solved

the issue of central bank's digital currency: in addition to some problems of bitcoin itself, bitcoin will also face the challenges of central bank's digital currency in the future. Part of the value of bitcoin lies in the application of its blockchain, and the transaction mode of blockchain is also a major direction for the development of banks in the future. Applying the same technology, the central bank can better examine economic activities and carry out macro-control, which may be more concive to economic development. At the same time, we are not sure whether the digital currency issued with national credit will be easier to implement and get better development. However, when central banks make similar attempts, they are bound to compete with bitcoin to a certain extent

the foundation and early development of bitcoin are based on people's desire to build a fairer monetary system. But with the financialization of bitcoin and the admission of institutional investors, we suddenly found that a large number of bitcoin has been in the hands of financial giants. Bitcoin as cryptocurrency, its transactions have been outside the supervision, there is no legal requirement for institutional investors to disclose the large amount of transactions of bitcoin to ensure the fairness of the market, which also provides a lot of space for institutional investors to manipulate the market. Retail investors enter the market with a good vision of digital currency, but in the end, they become the target of big predators. After harvest after harvest, more capital is in the hands of financial giants

2. For the whole system, friction is internal force, but for a single object, friction is external force

3. What I'm poor at is that the girl is out of town. Do you think that's the system you set up? If the system you build only contains the object, then the friction force is given by the outside world and belongs to the outside world. If the friction force and the object and supporting surface are placed in the same system, then the friction force becomes the internal force.

4. According to the law of conservation of mechanical energy, the condition of conservation of mechanical energy is that the system only has conservative force to do work, only carries out the transformation between kinetic energy and potential energy, and the mechanical energy remains unchanged. Therefore, for a particle, if it meets the condition of mechanical energy, neither external force nor conservative internal force does work, neither external force nor conservative internal force does work for a particle

5. This depends on your research object
for example, if the slider slides on the desktop, it is external force
if the slider and the table as a whole are the research objects, it is internal force

6. Physics terms. It refers to the interaction between parts of a system. Such as: the universe as a system, the interaction between stars is "internal force"; The atom is regarded as a system, and the interaction between electron and nucleus is "internal force".

7.

white gives people the most feeling of health and cleanliness, it is a symbol of light and peace. The feeling of white in clothing colorology is also understood in this way. What we will bring you next is epos-ladies series 4314.133.20.50.10 women's mechanical watch; White & quot; I'm not tired of matching. It's a good accessory between the wrists of Aibao watch. hblzj001bdzd

8. A kind of granular material called silica gel can be put into a closed container together with the watch that has accumulated water. After a few hours, take out the watch and the water will disappear completely. This method is simple and economical, without any damage to the accuracy and life of the meter. The silica gel that has absorbed water for many times can be dried for several hours at 120 ℃ (the temperature of inction cooker is fixed at 120 ℃, and it can be stir fried). The water absorption capacity is renewable and can be used repeatedly
if the water is not serious, but there is a layer of fog in the glass, then wrap the watch tightly with several layers of toilet paper or absorbent flannel, and bake it at 15cm away from the 40W light bulb for about 30 minutes to eliminate the water vapor
do not bake the cover close to the fire, so as not to deform the cover when heated. It can also be worn on the wrist with the watch cover facing inside and the bottom shell facing out, and the moisture can be eliminated after two hours. If the water is serious, it's better to send it to the meter shop to wipe oil immediately to remove the moisture of the movement, so as to avoid parts rusting.

9. Watch bump: because the watch is exposed most of the time in the process of wearing, it is easy to bump other hard objects when walking., If you accidentally knock or fall on the watch in daily use, it may lead to the movement gear and other parts of the watch loose, dislocation and other situations, which will also lead to the mechanical watch to stop stealthily. When this happens, we need to go to the watch repair shop for maintenance. Try to avoid collision and strenuous exercise ring daily wearing
hairspring problem: hairspring fault is also one of the reasons for the mechanical watch to stop stealthily when it is running normally. As we said earlier, some people stop their watches secretly e to insufficient activity. If the activity is too large, the winding mechanism will be broken down e to the tightening of the winding for a long time. It can also cause a lack of motivation. Generally, this kind of stop will happen from 9:00 to 12:00 in the evening. At this time, the watch with calendar function will drive the calendar wheel. It directly led to the lack of power, the calendar jammed and stopped
in addition, some other situations, such as the watch is magnetized, too much grease and so on, can also cause the mechanical watch to stop. If you find that the watch stops in the process of normal wearing, you should take measures to remove the fault as soon as possible. If the mechanical watch movement and other fault parts are involved, the watch needs to be sent to a professional watch Maintenance Center for inspection and maintenance.

10. Friction is internal force