The power of chopsticks
Thinking: Insert a chopstick into a cup filled with rice, and then lift the chopstick. Can chopsticks lift rice and cups?
Materials: a plastic cup, a rice cup and a bamboo chopstick.
Operation:
1. Fill the plastic cup with rice.
2. Press the rice in the cup by hand.
3. Hold the rice with your hands and put chopsticks between your fingers.
4. Gently lift chopsticks with your hands, and the cup and rice are lifted together.
Explanation:
Because of the extrusion between rice grains in the cup, the air in the cup is squeezed out, and the pressure outside the cup is greater than that inside the cup, so that chopsticks and rice grains are tightly combined and chopsticks can hold the rice cup.
Bottle race
Thinking: Two bottles of the same weight, one filled with sand and the other filled with water, roll down from a height. Who will reach the finish line first?
Materials: two bottles of the same size and weight, sand, water, a rectangular board and two thick books.
Operation:
1. Make a slope with a rectangular board and two books.
2. Pour water into another bottle and sand into the bottle.
3. Put two bottles on the board and let them roll down at the same starting height.
A bottle full of water reaches the finish line earlier than a bottle full of sand.
Explanation:
The friction between sand and the inner wall of the bottle is much greater than that of water, and there will be friction between sand, so its sliding speed is slower than that of a bottle filled with water.
Creation: change the substances in the bottle and let them compete!
Please accept and thank my better landlord, please. More questions and answers? Ask close questions
These are interesting! But please wait a moment, I will do it after school at noon tomorrow, and then I will choose you!
Thank you very much.
Please adopt it. Thank you.
Ask if the second experiment has been done, and the first one will try tomorrow.
How to write 400 words for the most interesting scientific experiment composition?
The most interesting scientific experiment in science class today is about the buoyancy of water.
When the class was over, the teacher left us a question to think about: What methods can we use to make eggs float on the water? Everyone shouted loudly.
Some said, "Add gasoline to the cup.
"The teacher shook his head.
Someone said, "Put the egg in a completely inflated balloon.
"The teacher shook his head again.
Others said, "eggs can't float on the cup."
The teacher said, "Do you want to know how to do it?" Everyone pricked up their ears.
The teacher went on to say, "The solution is simple. Just add salt to the cup.
The students were puzzled, and the teacher explained, "When salt is added to a certain amount, the proportion of salt water is greater than that of eggs, and then eggs can float on the water.
Students can go home and try it for themselves.
See if it's like the teacher said.
"Listen to the teacher, I still with a grain of salt.
I decided to go home and try it myself.
When I got home, I couldn't wait to put down my schoolbag and run to the kitchen.
I first found a cup, an egg and a packet of salt.
Then add a proper amount of water to the cup, and then carefully put the eggs into the water.
Then I add salt to the cup bit by bit.
However, the egg still did not move.
I said to myself, "What is this? Is it not enough for me to add salt? " So, I did another big thing, pouring half a pack of salt into the cup.
Thought, anyway, there is salt, enough for mom to cook.
And my courage to practice will be affirmed by my mother.
Just when I was complacent, a miracle happened! The egg did float a little.
I was so excited that I continued to add salt to the cup, and finally the egg floated on the cup.
I jumped for joy.
A group of interesting scientific experiments.
In the interesting little experimental science class, the teacher asked us to do an interesting little experiment: vinegar softens eggs.
I prepared a pack of white vinegar, an egg and a bowl according to the teacher's requirements. The experiment began. I put the eggs in a bowl and pour the white vinegar. I stared at the eggs carefully. After a few minutes, I found a layer of white bubbles on the egg skin.
At first, I thought that there would be more peculiar changes with bubbles, but it failed as I imagined.
After a long time, the egg hasn't changed at all, and I secretly whisper: alas! Really! What a waste of my time. If I hadn't been curious, I would have stopped soaking.
I stood up, picked up the bowl and gently grabbed the eggs.
When I was about to pour out the vinegar, I felt as if I was holding something soft.
I was shocked when I looked at the eggs in my hand. The original hard egg became soft, as if holding a steamed bun in his hand.
Why on earth is this? The teacher revealed the secret to us. It turns out that the main component of white vinegar is acetic acid, while the main component of egg shell is calcium carbonate, so the egg shell will be corroded by vinegar. It suddenly dawned on us.
Oh, this is really an interesting little experiment.
600-word scientific experimental composition
The best answer is the interesting little experiment "Ding Ling Ling". As soon as class began, the teacher came into the classroom with a big smile on her face.
"Students, have you brought all the eggshells?" "I brought it!" We answered with one voice.
"But what can eggshells do?" "Be a tumbler?" We whispered to each other.
"Today, we are going to do a small experiment with these two and a half eggshells.
Please guess before you do it. I poke the eggshell vertically with this pencil. Which eggshell will break first? ""Mouth down will break first! " Most boys pointed to half a shell and said.
"Mouth up first!" My deskmate said flatly.
Many girls are sitting and hesitating.
"That's great! Let's do it and see whose answer is correct.
"The teacher called a classmate for help. He put his mouth against the teacher's hand and pointed a pencil at the eggshell. As soon as his hand was put down, the pencil fell on the eggshell, which was not broken.
The second time I dropped the pencil, but it fell into the teacher's hand, and then fell to the ground. pencil lead broke it.
The teacher took out another pencil, this time she made it herself. The pencil was dropped only twice, and the eggshell with the bottle mouth up was broken.
Then, the teacher picked up the pencil and poked the eggshell with his mouth down.
"Once, twice, three times ..." We counted them together, but this half eggshell looks like wearing armor, and it won't break after being stabbed for more than a dozen times.
"Yes! I guessed right! " The deskmate danced with joy.
"good! Next, I let the students do it by themselves to see if this is an accidental phenomenon.
""yes, don't be too proud! "We are not convinced.
After doing this little experiment ourselves, we finally understand that the same two and a half eggshells are tied vertically with a pencil, because the downward eggshell is concentrated, so it is easier to be tied; However, the eggshell with its mouth facing down is scattered and not easy to be punctured.
No wonder all the workers and uncles in our school construction site are wearing face-down safety helmets. It turned out to be the same thing! Small experiments contain great truth. This course is really interesting!
Interesting little scientific experiment
Thoughts on electrified newspapers: without glue, tape and other things, newspapers can stick to the wall and will not fall off.
Do you know why? Material: 1 pencil; 1 newspaper.
Step: 1. Spread the newspaper out and lay it flat on the wall.
2. After a few quick rubs on the newspaper with one side of the pencil, the newspaper won't fall off just like sticking to the wall.
3. Lift a corner of the newspaper, and then let go, and the lifted corner will be sucked back by the wall.
Take the newspaper off the wall slowly and pay attention to the static sound.
Description: 1. Rubbing a pencil charges the newspaper.
2. The charged newspaper was sucked to the wall.
When the indoor air is dry (especially in winter), if you take down the newspaper from the wall, you will hear the crackle of static electricity.
Creation: Please try it. What else can be stuck to the wall by static electricity without glue? Thoughts on the separation of pepper and salt: I accidentally mixed the kitchen seasoning: pepper and salt. How can I separate them? Ingredients: pepper, salt, plastic spoon, small dish operation: 1 Mix the salt and pepper together.
2. Stir well with chopsticks.
3. Rub the plastic spoon on the clothes and put it on the salt and pepper.
4. Pepper sticks to the spoon first.
5. Move the plastic spoon down slightly.
6. After salt, stick it on the spoon.
Explanation: Pepper is electrostatically adsorbed earlier than salt because its weight is lighter than salt.
Creation: Can you separate other mixed raw materials in this way? Reflections on charged balloons: When will two balloons attract each other and when will they repel each other? Material: 2 inflatable balloons, 1 string, 1 cardboard. Operation: 1 Inflate two balloons separately and tie a knot in your mouth.
Connect two balloons with a thread.
Rub the balloon on your hair (or sweater).
Lift the middle part of the rope and the two balloons will separate immediately.
Put the cardboard between two balloons, and the electricity on the balloons makes them attracted to the cardboard.
Description: 1 The electricity on one balloon repels the electricity on the other balloon.
The electricity on the two balloons attracts them to the cardboard.
Creation: Can other small experiments be used to illustrate that balloons are charged? Lovely watermark thinking: the beautiful patterns on rice paper are not drawn, but how are they made? Material: 1 washbasin, 1-2 rice paper, 1 chopsticks, 1 cotton swab, 1 bottle of ink and water (about half a basin) Operation: 1. Pour half a basin of water into the washbasin and gently touch it with chopsticks dipped in ink.
2. Wipe the scalp with a cotton swab for two or three times.
3. Then touch the center of the ink circle and see what happens.
4. Gently cover the calligraphy paper on the water, and then pick it up slowly. What patterns are printed on the paper? Explanation: 1 When the cotton swab touches, the ink will expand into an irregular circular pattern.
2. A small amount of oil on the scalp rubbed by cotton swabs will affect the mutual pulling force of water molecules.
3. The watermark will present irregular concentric circles.
Creation: Try other methods to change the ink pattern on the water surface.
Intermittent thinking about water flow: why do many streams become a stream when you touch them with your hand? Material: a tin box, awl, water operation: 1. Drill five holes in the bottom of the empty tin can box with nails (the spacing between the holes is only about 5 mm).
2. Fill the water tank with water, and five streams of water flow out from five small holes.
Twist these streams together with your thumb and forefinger.
When the hand is removed, the five streams of water will merge into one.
If you wipe the small hole in the jar with your hand again, the water will become five strands again.
Description: The surface tension of water separates and closes the water flow.
Reflections on floating needles: Why do needles float on the water? Material: a bowl of water, needle, fork and liquid cleaner. Operation: 1. Pour a glass of water into the cup. Carefully put a needle on the water with a fork. Move the fork slowly, and the needle will float on the water. Drop a drop of detergent into the water and the needle will sink. Explanation: 1 It is supported by the surface tension of water.
Surface tension is the cohesive connection formed by water molecules.
This cohesive connection is due to the fact that some molecules are attracted together and the molecules squeeze each other to form films.
This kind of film is called surface tension, which can hold the object that should sink.
2, detergent reduces the surface tension, the needle will not float.
Attention: The needle is dangerous, please ask parents to help you operate it.
Magical toothpick thinking: Will toothpicks in water swim with sugar cubes in water or with soap in water? Materials: toothpick, a basin of water, soap, sugar cube operation: 1. Carefully put the toothpick on the water.
2. Put the sugar cubes in the basin, away from the toothpicks.
The toothpick will move towards the sugar cube.
Change a basin of water, carefully put the toothpick on the water, and now put the soap in the basin near the toothpick.
Toothpicks will stay away from soap.
Note: When you put the cube in the center of the basin, it will absorb some water, so there will be a small water flow in the direction of the cube, and the toothpick will move with the water flow.
However, when you put soap into the basin, the surface tension at the edge of the basin is strong, so you will pull the toothpick out.
Creation: Please try. If sugar and soap were replaced by other substances, in which direction would the toothpick swim to the perforated paper to hold water? Why can perforated paper hold water? Material: a bottle, a pin, a piece of paper, a full cup of colored water. Operation: 1. Fill the empty bottle with colored water.
Punch many holes in the white paper with a pin.
3. Cover the bottle mouth with perforated paper.
4. Hold the paper with your hand, turn the bottle upside down, and make the bottle mouth face down.
Gently remove your hand, the paper will cover the bottle mouth and the water will not flow out of the hole.
Description: Tissue paper can hold up the water in the bottle because atmospheric pressure acts on the paper, resulting in upward tension.
Water will not leak out from the small holes because water has surface tension, and water forms a water film on the surface of paper, so water will not leak out.
This is like an umbrella made of cloth. Although this cloth has many holes, it still won't leak rain.
The secret thinking of handkerchief: spread the handkerchief under the faucet. ...
Do an interesting experimental composition
In science class that afternoon, the teacher announced to us: "Today, I will do a very interesting experiment with you!" " ""yes! "As soon as the voice fell, the students cheered." Is it an experiment of throwing coins into the water? "A classmate predicted." That's right! Who has coins around you? ""me! Me! I have! " The students are scrambling to hand in their coins. At the beginning of the experiment, the teacher threw coins into a full cup. I crowded in front, my eyes wide open, staring at the cup tightly, for fear of missing any tiny link. "one, two, three ..." coins jumped into the cup one by one, and the water surface was rising. The teacher suddenly laughed that the water would overflow! "The students said in unison." No! We continue to look down! ""Who has a coin? "The teacher" searched "six coins from his classmates and carefully put them into the water one by one. After the last coin plopped into the water, it turned 360 degrees in the water like a trained diver before falling into the bottom of the cup. \x0d At this moment, the students were surprised to find that the water surface actually exceeded the mouth of the cup, and it was half a centimeter! The students immediately surrounded the teacher and asked why, but the teacher bought a pass and asked us, "What do you think? "We are all monks-puzzled. After repeated inquiries from our classmates, the teacher finally opened his mouth and said mysteriously, "This is the tension of the water. It is this invisible force that supports the water surface beyond the mouth of the cup without overflowing. "So that's it! We finally understood the truth.
Scientific experiment composition.
400 words, speed! ! ! ! ! ! ! !
It doesn't rain either early or late.
Just when I was thinking about going outside to observe the insects, the dark night began to fall and God began to "cry". I found some Lycium barbarum at the bottom of the cup very 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. I like insects. My mother let me drink gouqi tea. As soon as I saw Lycium barbarum tea, I became interested in it immediately.
Because I saw a lot of Chinese wolfberry floating on the teacup, I flattened it with a pair of chopsticks.
Because the air in the first medlar came out.
Then I took off my chopsticks to see if the Lycium barbarum would sink. I saw the Lycium barbarum sink slowly.
Today, I finished all my homework.
It turns out that my guess is right.
Then I put a wolfberry on the bottom of the teacup with chopsticks.
Through this little experiment! I can't help sighing at the sky, thinking: The weather was fine just now. Take off the chopsticks, and the Chinese wolfberry is really bubbling in the water. As I expected, it began to rain as soon as I went out, so I went outside to observe insects as soon as I was free.
When I was worried, I floated up and sank.
First, I took out two pieces of Lycium barbarum floating on the water and put one of them into the water. The wolfberry slowly floated up and finally floated to the water.
Well, I finally figured it out.
There is air in the second medlar.
Write a composition for a small scientific experiment, about 600 words, urgent! ! ! ! ! !
I like insects and go outside to observe them whenever I have time.
Today, I finished all my homework.
Just when I was thinking about going outside to observe the insects, the dark night began to arrival, and God began to "cry"! I looked at the sky and sighed, thinking: the weather was fine just now. It rained neither early nor late, and it began to rain just before I went out.
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 "Remember an interesting experiment"
Remember an interesting little experiment. I have been curious since I was a child, especially about flying. I want to glide in the sky most, so I like flying very much. It was noon, and I was bored playing with this golden cloth in front of me. Playing and playing, it suddenly occurred to me: why not use this cloth for parachute experiment? Do it. I immediately found four strings of the same length and tied them to the four corners of the cloth. I tried to pull four wires to make sure there was no problem. Then I found a small toy and tied all four ropes to it. Everything is ready. I climbed into a higher cabinet excitedly, stood up, grabbed my parachute and paratroopers and waved. I thought this parachute would fall down steadily, but something unexpected happened, and the paratroopers plummeted and finally failed to land safely. Heroic sacrifice. I was shocked: how can I jump out of the cupboard without thinking, grab the paratroopers, look around, and there is nothing wrong with it? After thinking for a long time, I finally came to the conclusion that the toy is biased. So, I immediately changed to a lighter toy, tied a rope on it, and did another experiment. As a result, the paratroopers ended in such a tragic way. I don't understand. There are still questions. Then I had a brainwave: there must be a lack of wind. So I took the paratroopers to the top floor again. Just when a gust of wind blew, I quickly dropped the paratroopers. Hey, Jesus! As soon as the parachute opened, the paratroopers landed leisurely on the ground and landed safely. I cheered, rushed downstairs, picked up the paratroopers and shouted excitedly, "I made it!" Success! " Although this is only a small experiment done a long time ago, it is deeply imprinted in my mind. Whenever I encounter difficulties, the parachute and paratroopers always appear in front of my eyes, prompting me to overcome all kinds of difficulties. In life, difficulties are like spring. You are strong, he is weak. If you are weak, he is strong. Therefore, as long as you can't bow your head in the face of difficulties, no matter how strong the difficulties are, you will only be defeated! I remember an interesting little experiment this Sunday afternoon. I was so bored that I could only sit in a chair and stare blankly.
Dad seemed to read my mind and said, "How about Dad doing an experiment with you?" Hearing this, I jumped up excitedly: "What are you waiting for? Go! " So, my father pulled me into the kitchen, turned on the tap and said to me, "Look at this water, it's flowing downwards. Can you make it turn? " I thought: it is impossible to make it turn a corner, and dad can't do it.
I said, "No.
Then can you? "Dad smiled and said," Look! " He took the spoon and rubbed it with woolen cloth several times to make it charged.
Dad put it near thin water, yeah! The water turned around and approached the spoon.
What's going on here? Does dad have magic? My father saw my doubts and said, "Tell you the truth: spoons are attractive to uncharged water." .
Once the spoon is exposed to current, this little experiment will not succeed.
Water is a conductor, which can immediately conduct electricity out of the spoon! Even water vapor floating in the air can be charged.
You got it? "I nodded.
"Come and try!" He gave me a spoon.
I just did it according to my dad's method, yeah! The current really turned! I became a magician, too.
This experiment is really interesting. Remember an interesting little experiment. I am a little boy who loves to explore new things.
I heard that after cutting an earthworm into two parts, it will not only die, but also become two live earthworms! To prove this, I did an interesting little experiment.
The students said that earthworms could be seen everywhere after the rain. One day after taking a bath, I really found an earthworm beside the flower bed without any effort.
When I got home on Friday, I took out my art knife, put the earthworm on a piece of paper and thought confidently: I will definitely complete the experiment successfully.
The experiment began. I carefully cut the earthworm in half. Take a closer look, huh? How can earthworms be as still as dead? I was extremely depressed: did my experiment fail? Just when I was depressed, I suddenly remembered what my mother had said to me: "Don't give up when you encounter difficulties, my mother believes you can do it!" " "So, I cheer up and continue to do experiments.
I took "100,000 Why Biology Articles" and began to look up some information about earthworms.
I rummaged around and found the answer.
Oh! It turns out that after the earthworm is cut off, the muscles next to the wound will tighten immediately, just like the door that was still open will close immediately. It's amazing! Earthworms are actually very regenerative, so that's it! After two or three days, the divided earthworm can become two complete earthworms! Seeing this, I seem to see the dawn of victory and have confidence again! Two days later, when I went to see my earthworms again, I really found two small earthworms crawling around in the box! I told my mother about it, and she smiled and said, "Haha, our son will learn to do experiments by himself!" " "This is a small experiment I have done before. Isn't it interesting?
Seeking composition "an interesting experiment"
Today, we did an interesting experiment at Mr. Sun's house. As soon as class began, the teacher said to us, "Shall we do the experiment today?" The students said in unison, "Good!" The experiment began and the students were very happy. They carefully observed the teacher's every move and saw that the teacher had brought a fish tank and a slippery egg.
Then, the teacher said to us, "is there any way to make eggs float on the fish tank?" The requirement is not to use tools.
The students immediately began to argue, and some said, "This is impossible. How can eggs float in mid-air? "Some students said," You can add water to the fish tank and let the eggs float in the air.
"The teacher listened to our proposal and said to us," Then let's try! "After that, I added some water to the fish tank and put the eggs in the fish tank, but the eggs didn't float.
The students saw it and said noisily, "There is too little water, too little water. Go and add some more water."
"The teacher added some water, but the eggs didn't float.
The students feel a little strange. How can I make eggs float? The students were thinking when suddenly several students shouted, "Add salt to the water and the eggs will float." .
"The teacher smiled and said," Then I'll try again according to what you said.
"So, the teacher went to get some salt, scooped a little into it with a spoon and stirred it a few times, but the egg was still disobedient and sank to the bottom. The students shouted, "Play more, play more, play more! "The teacher listened and scooped a few more spoonfuls, but the egg sank naughtily. The teacher stirred the water a few times, and the eggs did not move after several turns with the water.
The teacher looked at it and said to us, "Add some yourself!" After listening, the students scrambled to pick up the spoon and add salt to it. More than half of the salt was put in, but the egg still lay quietly at the bottom of the water.
The teacher added a few spoonfuls of salt, stirred it vigorously, and the eggs rotated with the spoons, and then sank into the fish tank without mercy.
At this time, some students were a little depressed and said, "Don't do it, forget it, it's a waste, it's a waste of salt."
Finally, the teacher said, "it doesn't matter, these salts can be precipitated."
"Say that finish, he picked up the bowl, simply poured it into the fish tank and stirred it a few times.
Finally, a miracle appeared, only to see the egg slowly floating and playfully sticking its head out of the water. The experiment was successful, and we cheered.
Why is this? It turns out that the salt water content in the tank is over 30%, and the proportion of salt water is very large, so the eggs can float.
After listening to this, I suddenly realized, but at the same time, I also had many feelings. This is not only the power of water, but also an invisible power that salt contributes to water. Only when salt and water are combined can eggs float.
But people often only see the power of water and ignore the power of salt. Many people in our lives are like salt in our experiments, such as cleaners and pavers. Their spirit of silent dedication is not worth learning. This is an interesting experiment.
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