Give you a straw, an ordinary straw for drinking fruit juice, and give you a potato, a fist-sized potato just bought from the vegetable market. Excuse me: can you penetrate potatoes with a straw?
Can't! You could say that. What would happen if you were given an auxiliary tool-a cup?
I was reading a popular science magazine at noon today and saw an article entitled "Penetrating potatoes with straws". I find it incredible. Potatoes are hard, that fragile straw ... think about it, and I think of that classic.
The advertising slogan "Anything is possible". So I prepared the experiment with the mentality of overthrowing this statement and witnessing the miracle. To tell the truth, I am extremely ambivalent, but most of them still can't do it. Seeing is believing, and then driven by curiosity, I found a cup, a potato and a straw.
I first put the potato rack on the cup, then grabbed the straw with four fingers of my right hand, then buckled the top of the straw with my thumb, and finally stuck it hard-the straw Huo Ran passed through the potato.
I can't believe I rubbed my eyes, but I still kept the graceful posture of straw and potatoes. I still don't believe it. I think of magic, which reminds people that when they see it with their own eyes, they will have hallucinations. I don't believe my eyes anymore. I called my mother, and she didn't believe me, but we changed straws, potatoes and cups. We did several experiments and the results were the same. I have to believe it's true.
Later, I understood that the key of this experiment is to fasten the top of the straw with your thumb. In this way, the straw cut off from the airflow becomes extremely hard enough to penetrate the potato.
I have to admit how ridiculous my "hypothesis" was before the experiment. A slender straw really has the ability to penetrate potatoes.
This little experiment woke me up. In life, how many "impossibilities" exist only in the brain and not in the real world. And I, because of the "impossible" in my heart, missed many opportunities to try!
When the straw penetrated the potato, it also penetrated the prejudice in my heart. Science is around us, we should learn to try to believe!
2. Life Tips Composition 400 words
In my life, many things have happened, just like the stars in the sky, countless. But there are many things I have forgotten, only one thing I remember.
I remember accidentally knocking over the water cup when I was doing my homework, and my homework was all wet with water. I quickly picked up a piece of facial tissue and put it on my exercise book, but the moisture was reduced and the words were covered with "wrinkles". I was so anxious that I suddenly remembered that I had a computer at home. I turn on the computer and browse the web. The web page says: before the water in the exercise book is completely dry, flatten the book with a heavy object and then put it in the freezer of the refrigerator to cool it. I followed the method on the computer with a grain of salt. Not long after, I took out my exercise book from the refrigerator and was surprised to find that the water in my composition book "disappeared", as if it had never been wet by water. I browsed the webpage again, and it said: The wet exercise book was flattened before being put in the refrigerator, and the water inside was taken out after being put in the refrigerator, which played the role of dehydration, so the wet exercise book was restored to its original state. I suddenly realized after reading it.
There are many tricks in life. As long as we pay attention to observation, be good at studying and study hard, we can know many tricks in life. These tricks can help us solve problems and bring help to our lives.
3. Thesis: Physical knowledge in life, 500 words.
main body
Generally speaking, the content of the theme of academic papers should include the following three aspects: 1. Facts (examples or phenomena of language, culture, literature, education, society, thoughts, etc. obtained through my actual investigation). The factual basis put forward shall be objective and true, and the source shall be indicated when necessary; 2. Relevant statements of predecessors (including the investigation methods, investigation processes and conclusions of predecessors). In theoretical analysis, we should clearly distinguish other people's views from my own. Whether directly or indirectly citing the achievements of others, the source should be indicated; 3. My analysis, discussion and conclusion, etc. Combine the factual basis, predecessors' achievements and my own analysis organically, and pay attention to the logical relationship between them.
conclusion
The conclusion should be the final and overall conclusion of the graduation thesis, in other words, the conclusion should be the end and destination of the whole thesis, not the conclusion of a local problem or a branch problem, nor the simple repetition of each paragraph of the summary. The conclusion is that the conclusion of this paper should reflect the author's deeper understanding, and it is a new academic general concept and general view drawn from all the materials of the whole paper through logical analysis processes such as reasoning, judgment and induction. Conclusion The word "conclusion" can be used, which requires a concise and accurate explanation of one's creative work or new viewpoint, its significance and function, and also puts forward problems and suggestions that need further discussion. Conclusion should be accurate, complete, clear and concise.
This part of the writing content should generally include the following aspects:
What does the result of this paper show?
What amendments, supplements, developments, confirmations or denials have been made to the previous viewpoints?
The shortcomings or unsolved problems in this paper, as well as the possible key points and directions to solve these problems.
refer to
References (tables) should generally be listed after academic papers for three purposes, namely:
To reflect the real scientific basis;
In order to reflect a serious scientific attitude, distinguish one's own views or achievements from those of others;
In order to show respect for the scientific achievements of predecessors, we should also indicate the source of the cited materials for easy retrieval.
The writing of graduation thesis should be based on a rigorous and realistic scientific attitude. If others' achievements are cited, they should be listed in the references in the order in which they appear in the papers, and only the relevant works and papers cited or referenced in the paper should be listed. References should list the main references directly cited in the order in which they appear in the text.
Express gratitude/gratitude
According to the provisions of GB77 13-87, the words of thanks can be placed at the end of the article, reflecting the thanks to the following aspects: National Science Foundation, scholarship funds supporting research work, contracting units, enterprises, organizations or individuals funded and supported; Organizations or individuals that assist in the completion of research work and provide convenient conditions; Someone who gives advice and help in research work; Owners of materials, pictures, documents, research ideas and ideas that have the right to reprint and quote; Thanks to other organizations and individuals. In our graduation thesis, we mainly thank the tutor and the people and units who have made direct contributions and help to the thesis work.
appendix
For some contents that are not suitable to be put into the text, but are an essential part of the graduation thesis or have important reference value, they can be included in the appendix of the graduation thesis. Such as original questionnaires, data, charts and their descriptions.
4. Life needs knowledge 400 words composition
There is a feeling of silence, but it is enough to move people; There is a kind of love, no regrets, even if you sacrifice everything, you don't ask for anything in return. When the footsteps in the wind and rain are tired, when life outside is difficult, when your heart needs to talk, there is always a door open for you. Although this house is not gorgeous, it is enough to block the wind and rain outside the window and rekindle your enthusiasm for life. This is home, a harbor full of love. I remember it was a rainy day. After school. My classmates poured out like a flood. I also rushed to grandpa with excited steps. Suddenly, I felt someone push me and I fell into a puddle. Suddenly, there was mud on my hands, clothes, shoes and socks. I'm wet and cold! I saw the man pushing me turn and run into the crowd. I cried with a "wow" and no one came up to help me. I walked out of school sadly. Grandpa saw it and immediately took out a handkerchief from his pocket and let me hold it in my hand, which made my stiff hand feel warm. Then I got on the bike and quickly pushed it away. The rain gradually subsided, and the cool wind hit my hands and face as if I were wearing it. Grandpa's back is very warm I can only hear the creaking sound of the bicycle, and it is getting more and more urgent. Grandpa kept asking me if I was cold all the way and told me not to worry. Finally, when I got home, my grandfather helped me change clothes and prepare meals. My parents and grandma came to take care of me, and soon my cold body gradually eased and my dirty clothes changed.
5.400-word Life and Science Composition
In our previous life, countless problems have been bothering us, but with the rapid development of human science, the problems around us are gradually decreasing.
But because of my shallow knowledge, there are still many problems around me that bother me. For example, why does the fish's tail always stand upright? How do earthworms distinguish between day and night? Why do cats always lick their hair? Why can fish react so quickly to their surroundings? How do fish sleep? ..... These seemingly simple questions make me usually talkative and I don't know how to answer them at the moment. In order to solve these problems, I look up information on the Internet.
I soon found the answers to these questions: Earthworms generally live in the moist and loose soil at the depth of 10-30 cm underground; Mainly eat humus containing impurities such as organic matter. There are many photosensitive cells in its skin. Although they have no eyes, they can feel extremely weak light and are more sensitive than people.
Moreover, its tactile tube is very developed and sensitive to ground vibration and noise. Cats like to lick their fur often. Usually, everyone thinks that my cat is really clean and can comb its own hair. In fact, licking your hair is a way to relieve your mood.
In addition, cat fur is rich in cholesterol and ergot, which can be converted into vitamin D after being irradiated by ultraviolet rays in the sun and accumulated in fur. Cats have thick skin and can't absorb vitamin D like other animals' skin. Therefore, it has to lick its fur with its tongue to get the vitamin D needed to maintain its physiological activities.
Fish live in water almost all their lives. They either swim left or right in the water, so it is very practical to have a strong and vertical tail. It can help fish change direction freely in the water.
The lateral line of the fish can sense the subtle change of water pressure, so it will know the surrounding situation from a long distance. Generally, a large vibration will make the fish have an avoidance reaction and quickly hide in aquatic plants or gaps.
Most fish have color-changing function, and their body color is darker in the dark, lighter in the light and lighter when chased by natural enemies. Some special fish have different ways to escape. For example, loach will crawl into the river bed, while flying fish in the sea will choose to jump out of the water and slide to avoid the enemy's harm.
Some primitive fish in Amazon will use weak current to detect the surrounding situation and then respond. Fish also sleep.
Because fish have no eyelids, they can't close their eyes. It looks as if it never sleeps.
When most fish sleep, they just stay quietly in the water. Many fish (such as perch) sleep on or under logs at night.
Corals are active during the day and rest in cracks in rocks at night. Fish look very different at rest from other times.
For example, many small fishes of CYPRINIDAE are active during the day and disperse at night, so shallow water is not advised. Some fish rest during the day and move at night; But almost all fish have to sleep.
Some animals have been swimming because they have to keep spitting out water to keep breathing; But they may still sleep when they exercise. We just don't know. It's just static. Just like when people sleep, fish rest their bodies in this way.
After reading these contents, a big question mark in my heart was finally solved. I have gained a lot of new knowledge by consulting materials, which makes me understand the importance of science to human construction and development, and also makes me understand that I should study science more seriously and make contributions to the cause of science when I grow up.
6. Physical phenomena in life: 800 words.
For physics, there are always people who find it difficult to learn and are afraid of it. In fact, this is completely unnecessary.
Learning physics can start from life.
Now the physics we study is closely related to real life, and many far-reaching discoveries are born from life.
When studying physics in life, we should carefully observe the things around us, try to solve them by using what we have learned and explain the truth clearly. Pascal was full of curiosity about things when he was very young, and never thought that a thing "should have been ..." So under the guidance of this spirit, Pascal explored the principle of sound production when he was less than 10 years old. And has made outstanding achievements in physics.
Learning physics in life can not only be satisfied with the knowledge in textbooks, but also read more books after class and learn physics by modern means. In this way, we can better understand the knowledge in the textbook and be well informed. If we compare what we have learned to a ship, then to some extent, the knowledge gained after class is the river that carries the ship on a long journey. In this way, we can make continuous progress; If you can't do this, you will always stay in the realm of "knowing". Even if you get good grades, you can't make yourself feel satisfied and happy.
To learn physics in life, we must master the correct learning methods. Preview before class means that you have enough time to digest knowledge and pay attention to the important and difficult points in the textbook. After class, you should review, recite the laws of physics, and do more difficult and trapped questions, which will help improve your grades.
7. Know the physical composition of 350 words
Today, I read some books and learned some physics knowledge. The full name of physics is physics, which studies the basic elements of the universe: matter, energy, space, time and their interaction. Physics is closely related to many other natural sciences, such as mathematics, chemistry, biology and geography. Especially math, chemistry and biology! feel
With the rapid development of science and technology, natural science theory plays an increasingly important role in social production and social life. As the basic science of natural science and the theoretical basis of modern technology, physics has been paid more and more attention in various disciplines of general education. In modern society, it is difficult for a person to adapt to modern life without basic physical knowledge. Even if his future work has little contact with physics, he will always encounter many modern equipment in his daily life. As for the future technical or scientific research work, physical knowledge is even more important. Therefore, physics class plays a very important role for each of us.
Since the role of physics and its significance to human beings are so great, I intend to study physics well!
8. Looking at Physics Composition through Life 500
Friction makes society progress.
Friction is a physical phenomenon. Without friction, we can't walk or hold the cup. Moreover, friction is also a social phenomenon, ranging from interpersonal friction to class friction, and even the friction between man and nature. Through summary and analysis. It is not difficult to find that there is no Bak Yan-style self-friction in every social progress, so the importance of friction can be seen.
The earliest striking fire was that ancient humans used the physical phenomenon of friction to generate heat. With fire, humans began to cook with fire, keep warm with fire, and defend themselves with fire, so human civilization has also made great progress. With the continuous progress of society, the social function of friction gradually emerges. Qin Shihuang destroyed six countries, unified the world, praised famous cities, killed heroes, built Epang Palace and built the Great Wall, which made the people work hard. So there was a great friction between the people and Qin Shihuang, and it was this friction that led to the Chen Sheng and Guangwu Uprising, which led to "burning the people and burning the earth". The friction force has changed greatly. When one dynasty dies, another dynasty rises. This is the progress of history, the establishment of the whole society, the establishment of People's Republic of China (PRC), and the people's turning over as masters of their own affairs. Friction has played a huge social role and made the society develop and progress continuously. Imagine that if there were no friction in the world, even if human beings could survive, then even drilling for fire would never be mastered by human beings, let alone the progress and development of society.
As the most basic unit of society, the friction between people will naturally become more frequent. Some people think it's bad to have friction with others. In fact, two people have had friction, and both sides have more or less shortcomings and unsatisfactory places, which also points out our own shortcomings and tells us the direction of further improvement and improvement. Just like Lin Xiangru and Lian Po in history, Lin Xiangru did not argue with Lian Po after the size of his official position. When Lian Po realized his mistake, he proposed peace, and Zhao became more United and powerful. So the friction between people is not bad. The key is to be good at finding reasons from oneself, resolving contradictions, and making friction turn harm into benefit. People's hearts are United, productivity is developing rapidly, and society is progressing naturally.
As long as we face friction correctly, solve it and make use of it, society will progress because of it.