Sixth grade scientific composition

In life, work and study, many people have written compositions, which are divided into primary school compositions, middle school compositions and college compositions (papers). Do you know how to write a good composition? The following is my collection of sixth grade 10 scientific compositions, hoping to help everyone.

Science is wonderful. In science, we can find many kinds of problems. Let's walk into the strange world of science together!

When learning how to use tools in class, I think everyone can use tools, so why learn? After climbing, I thought: the original tools should be used in the right place, but it is wrong to use ropes to move stones down.

Later, I learned the lever. After the teacher explained it, I realized that a stick lying flat on the table is not a lever. Use it only when lifting heavy objects. That's called a lever. It is also known that the lever has three important positions, namely fulcrum, resistance point and force point. I didn't know until I did the experiment that the lever is labor-saving and laborious, neither labor-saving nor laborious. However, whether it is labor-saving, laborious, or neither labor-saving nor laborious, there is only one situation.

After studying the lever tools, I know that the three points of each lever may be different. And I think the three points of the stapler are very special. But why are some lever tools designed so hard? I think it was designed for convenience. Otherwise, we won't have chopsticks for dinner.

After taking the axle class, we found that it is labor-saving to exert force on the wheel and labor-saving to exert force on the axle. Chen Xinzhi in our class has become a Hercules in the experiment, even Sun Hao, who has the greatest strength, can't turn around. This is because the light part of the screwdriver is like a shaft and the handle is like a wheel. It is more labor-saving to apply force to the wheel than to the shaft. The influence of wheel size on the axle is that the bigger the wheel on the axle, the more labor-saving it is under the same axle size.

After learning the crown block and moving pulley, it is found that using the crown block is not labor-saving, but it can change the direction of force. However, the moving pulley can save half the force, but it can't change the direction of the force. Use crown block when lifting heavy objects, and use moving pulley when moving with tower crane. Combining them into a pulley block can not only save labor, but also change the direction of force.

Recently, I visited the Science and Technology Museum of Hebei Province. The Science and Technology Museum has several exhibition areas: power and machinery, electricity and magnetism, mathematics, Hebei scholars, universe and aerospace, sound and light, applied technology, life and health, etc. The visit to the Science and Technology Museum opened my eyes. I learned a lot of scientific knowledge, felt the infinite charm of science, felt the convenience and changes brought by science and technology to our lives, and let us enjoy the happiness brought by science and technology.

In the "electricity and magnetism" exhibition area, I enjoyed the wonderful performance of "playing with robots". The beautiful music played by robots is similar to the music played by piano master in our real life, which makes me feel the magic and shock of science. I also participated in interactive projects such as "Magnetoelectric Gallery", "Strange Wheelbarrow" and "Special-shaped Gear", which made me feel that science is really wonderful.

Science and technology are an indispensable part of our daily life. It has greatly promoted the development and progress of our society and brought about earth-shaking changes in our lives. Science is everywhere around us.

For example, why can't microwave ovens heat food with metal utensils? Because transparent things like glass can let microwaves penetrate, but metals can't. Microwave will reflect back when it touches metal. Not only can it not heat food, but it will also burn electrical appliances and eventually damage them. If we can't operate household appliances scientifically, unimaginable consequences will occur, so understanding scientific knowledge will bring us a safe and convenient life.

And why can the pulsator washing machine wash clothes? The reason is to use the power of impeller rotation to drive the water flow and push the clothes to rub the bucket wall to wash clothes. The drum washing machine rotates clothes up and down, left and right by clockwise and counterclockwise rotation, so that laundry detergent can penetrate into clothes more effectively to wash clothes. It is also a washing machine, but the principle is different.

There is a lot of scientific knowledge around, for example, at the same temperature, frozen pork thaws faster in water than in air; Nails that burn in water cool faster than those in air at the same temperature; A cup filled with boiling water cools faster when immersed in water than when immersed in air at the same temperature. All the above scientific phenomena show that water has better heat transfer performance than air.

Science brings us endless surprises. For example, people's genetic engineering through scientific research is an achievement. The greatest advantage of genetic engineering is that it can cure diseases. It can cure minor colds and life-threatening cancers, thus achieving the purpose of prevention and treatment.

Science around us is everywhere, and science around us is inseparable. In short, learn scientific knowledge well, have fun from science, study, love and use science happily, arm your mind with science, make yourself smarter, enrich our lives with scientific knowledge, and make our lives more colorful. Let's experience the happiness that science brings to our lives!

I have a dream, that is to be a scientist and make contributions to mankind.

If one day: my name will appear in the Guinness Book of World Records and the Nobel Prize, it is because I established the world's first immigration base under the sea, which completely solved the problem of hypoxia under the sea.

Due to the increasing population, the earth can no longer bear the total number of human beings. In the field of science, scientists put forward the idea of immigration. Imagine building an immigration base on Mars, but without oxygen and gravity. At this time, some people said that they could invent a pill that could breathe on Mars and stay indoors. ...

However, the invention of this pill is very difficult and impossible to complete. It takes a lot of manpower and financial resources to build rockets. After careful consideration, I came up with a good idea: we can build an immigration base on the undeveloped seabed. Fish genes and human genes were extracted and made into pills. After taking this pill, people can swim freely and breathe freely in the water. When they need to go out, they just need to put on frogman's frog shoes and tights. The vehicle is a domestic submarine. This kind of submarine walks without any bubbles, just like floating, as long as there is water, it can be started without any fuel. The house is waterproof so that you won't be affected at home.

If one day, people all over the world will feel the progress and greatness of science.

Outside the window, the bright sunshine shines into the classroom.

In the classroom, under the podium, fifteen groups are gearing up, as if to make a splash in this upcoming scientific experiment, and a big war is on the verge. That's right! This is the scientific experiment exhibition of our class!

"Zheng Da" came to the podium with small steps and found the first prey, that is, me!

I unhurriedly took out the materials from the toolbox. First of all, I scooped a spoonful of small citric acid powder with a medicine spoon and was about to put it into a test tube. Teacher Zheng asked with a microphone in his hand, "What is this?"

I answered methodically: "citric acid powder." At this moment, the teacher began to write on the blackboard. I used this gap to inject crystalline citric acid powder into the test tube. The teacher looked at me intently and then asked, "What are you going to do next?" "This still use to ask? Just read the book directly? " I muttered to myself. However, I looked up and faced Mr. Zheng's "studious" face, so I had to make do with the answer: "After injecting 4 drops of water, shake the test tube slightly."

The teacher began to take notes on the blackboard again. I quickly wiped the medicine spoon, took a spoonful of calcium carbonate as white as starch and injected it into the citric acid solution. The show started-

The originally clarified solution became light or thick milky white and turbid. Through the glass test tube, I saw the solution rolling up and down, as if something was stirring inside, and the ultimate moment came-"5-4-3" ...

In the anxious eyes of the students, the bottle exploded like a pot, and a burst of colorless bubbles emerged. I was really disappointed at first, because the reaction was not intense enough. But it didn't take long for the bubbles to get bigger and bigger, and several of them almost gushed out of the test tube wall, which succeeded!

The students exclaimed one after another. Even more amazing is the experiment done by Liang Zhining. Although she and I are both "citric acid reacts with calcium carbonate to produce carbon dioxide", her experimental reaction is more intense and wonderful. And Li Wenlong's "Preparation of Copper Sulfate Solution"; Chen's Proof of the Existence of Friction has opened our eyes! This is really an unforgettable small exhibition of scientific experiments!

In the afternoon sunshine, our exploration of science continues.

-P.S.

Everyone has dreams, but there are differences. My dream is to be a scientist!

As for why I have this dream, I think modern technology is still not convenient enough, so I want to invent something beneficial to mankind. I have thought about the direction of invention, that is, residence and travel, to make people more convenient.

Ideal is a cup full of water, reality is that cup, and the effort is to add water to it. If this glass of water is full, it means that you have successfully completed your ideal. Besides, you can only be happy if you realize your dreams, just like Francisco in Spain? Pizarro said: If you want to walk high, use your own legs! Don't let others carry you aloft; Don't sit on other people's backs and heads.

On this day, I got on the travel tool I invented. This is a spaceship that can sail at the speed of 30 million light years per hour, but it is the latest product. I started the spaceship and came to the 402 124 technology parallel universe discovered by human beings. This is the most developed universe, and today is an important day, because today I am going to test an epoch-making travel product newly invented by me-teleport machine. This machine can teleport to any position, which is a milestone in the history of human invention. When I arrived at the experimental base, many people paid the highest respect to me. The test has begun. The brave experimenter sat on the equipment and only heard a ding. They appeared in the target position, and the test was successful! My tears poured out like a torrent. I am so excited! My day and night work has paid off!

In order to be a good scientist, I read many books about science. I have basically customized the principle of my conveyor. First, I break people down into atoms, and then put them together in another place.

My dream is to be a scientist, which cannot be changed!

I looked at the sky and sighed, thinking: The weather was fine just now. It doesn't rain early, and it doesn't rain late. I was just about to go out when it began to rain. When I was worried, my mother asked me to drink wolfberry tea. As soon as I saw Lycium barbarum tea, I became interested in it immediately. Because I saw a lot of Lycium barbarum floating on the top of the cup and a few Lycium barbarum at the bottom of the cup, I felt particularly strange. Why do some Chinese wolfberry float on the water and some Chinese wolfberry sink under the teacup? I thought about it carefully: maybe Lycium barbarum is like a ball, and there is air in it that can float on the water.

I started doing small experiments. First, I took out two pieces of Lycium barbarum floating on the water, put one of them in the water and flattened it with a pair of chopsticks. As I expected, Lycium barbarum really bubbled in the water. Then I took off my chopsticks to see if the Lycium barbarum would sink. I saw the Lycium barbarum sink slowly. Then I put a wolfberry on the bottom of the teacup with chopsticks and took off the chopsticks. The wolfberry slowly floated up and finally floated to the water. Well, I finally figured it out. It turns out that my guess is right. Because the air in the first medlar came out, it sank. And there was air in the second medlar, so it floated up.

Through this little experiment, I learned a truth. Lycium barbarum is like a ball. With air in it, it can float on the water, but without air, it will sink. composition

By chance, I flipped through the book Hero of Science and Technology. Unexpectedly, this flip made me fall in love with this book and science. The spirit of those scientists at all times and in all countries deeply touched me and made me admire. Zu Chongzhi, the father of the innovator; The tenacious sky legislator Kepler; Einstein, a scientific superman with extraordinary intelligence; There is also the physically disabled but determined explorer Hawking ... but what I admire most is Galileo.

Galileo was a famous Italian physicist, astronomer and philosopher. He pays attention to observing various natural phenomena and is good at thinking, so he has made amazing achievements and is known as the father of modern science.

I worship him because he believes in truth. When I read about his in-depth study, I had doubts about Aristotle's theory of falling objects and decided to do experiments in the leaning tower of Pisa, even I didn't care, let alone people at that time. In the eyes of those pedants, Aristotle is the truth and truth is Aristotle, and almost everyone has no hope for his experiment. But even with more vitriolic words, more public opinion attacks and more inculcation from relatives and friends ... Galileo continued his plan fearlessly, and when he sought land, it must be an important moment of the times! Galileo was right. He proved their idea wrong with facts! No one can be the spokesman of truth, including Aristotle.

I admire him because he is rigorous and realistic. In order to prove that the earth revolves around the sun, he observed the stars countless times in front of the astronomical telescope; In order to prove that the sun is just an ordinary star, he wrote countless research reports; In order to prove that all stars are huge celestial bodies like the sun, he has done countless experiments; In order to prove that all the celestial bodies in the universe are moving, he thought all night.

It is precisely because of Galileo's scientific spirit of believing in truth and his rigorous and realistic working attitude that he reached the peak of science. Although I am not a great scientist like Galileo, I also love science. Often do small experiments, explore knowledge and understand the truth. Moreover, I also have the spirit of believing in truth. Sometimes I have different answers to other people's questions, but I can always analyze them in time, adopt the correct answer and win the affirmation of others. I believe, believe in the truth, be rigorous and realistic, will give me wings and soar in the scientific community!

Look at today's society, science is everywhere, smooth roads, high-rise buildings, cool car, magic lamps ... all these are invented by great scientists, who are doing their part for the society and making it develop faster and better! In my heart, I always have a feeling of admiration for them. Today, I came to the country of science to chat with them.

Shenzhou VI

Shenzhou VI manned space flight was a complete success. At 4: 33 am on June+10/October 65438+July, 65438, after a space flight of 1 15 hours and 32 minutes, China's manned space science experiment was completed, the Shenzhou-6 return capsule landed smoothly, and the astronauts' fee and Nie Haisheng left the capsule independently. The success of Shenzhou VI's manned space flight marks another milestone victory in the development of manned space technology and manned space experiments in China, which is of great and far-reaching significance for further improving China's international status and enhancing China's economic strength, scientific and technological strength and national defense strength.

Cup chip

Godson 2 is the first 64-bit high-performance general-purpose CPU chip in China, which was developed by China Academy of Sciences. Its single-precision peak floating-point operation speed is 2 billion times per second, and its double-precision floating-point operation speed is 1 100 million times per second. The highest frequency is 500MHz, and the power consumption is 3 to 5 watts, which is far lower than that of similar chips abroad. The measured performance of its standard test program is 2-3 times that of 1.3GHz VIA processor. The Ministry of Information Industry, the Ministry of Science and Technology, the Chinese Academy of Sciences and Jiangsu Province cooperated to establish the "Zhongke Menglong" Loongson industrialization base, and a high-tech industrial chain with the goal of Loongson industrialization was initially formed.

Kezuanyi well

After nearly four years' efforts, the scientific drilling project "Kezuan 1 Well" in mainland China was successfully completed, and it was successfully drilled into 5 158 meters underground in Maobei Village, Donghai County, Jiangsu Province, and a series of scientific research achievements were made on this basis, which marked a major breakthrough in China's "underground" plan. This is also the deepest scientific drilling among more than 20 projects of the International Continental Scientific Drilling Program currently being implemented.

Drug molecular transport carrier

The "drug molecular transport tool" that can pass through blood vessels has been successfully developed, and the "nano-drug molecular transport tool" developed by Shanghai Institute of Silicate, Chinese Academy of Sciences has a diameter of only 200 nanometers. The loaded drugs will not leak along the way until they are guided to specific disease targets and released when people need them, which will have a therapeutic effect on diseases. The researchers successfully completed the controlled release and directional delivery experiment of anti-inflammatory, analgesic and anticancer drugs loaded with "transportation tools". This achievement was published in Journal of American Chemical Society and German Journal of Applied Chemistry.

Shenzhou VI, cup-shaped chip, scientific drilling, drug molecular transport vehicle ... how amazing, I will study hard in the future and do my part for the society!

I had a science class during the day and was very interested. In the evening, when I got home, I did an experiment called "underwater volcano".

The materials needed for the experiment are: a small bottle, a big glass jar filled with cold water, a string and a few drops of red ink.

The experimental method is very simple. The first step is to wrap a string around the neck of a small bottle.

However, what should I do if the vial is unbalanced at this time? You can wrap another rope around the bottleneck. This way, the eldest son can keep balance with the ropes on both sides of the bottle mouth. Step 2: Fill the vial with hot water. After filling, drop a few drops of prepared red ink into the vial. Step 3, slowly put the vial into a large glass jar filled with cold water and put it at the bottom of the jar. At this point, the steps of the whole experiment are completed.

Next, let's see what's new. In less than five minutes, I was surprised to find that the red water in the small bottle gave off a red "flame" like a volcano, forming a wonderful "volcano in water" phenomenon.

Through the experiment, I understand a scientific truth, that is, the law of "heat is light and cold is heavy", that is, the density of hot water is small and the density of cold water is large. After this experiment, I also love science more.

I really want to be a scientist, because scientists can make great contributions to mankind.

If I were a scientist, I would make a micro robot. Although this robot is only half the size of a coin. Although he is small, he is of great use! It can enter the human body and suck the tumor in the human body.

The dean of a big hospital came to me and said, "There is a strange patient in my hospital. The patient said he had something in his nose. I saw a big tumor. I read about your invention in the newspaper. So I came to you to treat this patient with your invention-micro-robot. I used the remote control to drill into the patient's nostrils. I pressed the yellow button again and the robot began to work. It can be clearly seen from the display screen that there is a needle-like little thing on the right side of the robot body, which is the tumor eliminator. The robot is already working, and the tumor is gradually shrinking ... and then shrinking ... Ah, it worked! I was so excited that I almost cried. Yes, I stayed up under the lamp for many nights and wrote many experimental papers to make this robot! I pressed the red button again, and the robot came out of the patient's nasal cavity smoothly, and it was intact.

"Does it hurt?" I asked. The patient replied, "It doesn't hurt at all." I am also very excited to see him so happy.