Let's imagine. Children must be the happiest. Because they don't need to go to parks and playgrounds, they can play some games that we can't even imagine now. They can fly into the sky without any tools and instruments, or they can put kites into space without any wind. Oh, that's incredible! Of course, in other ways, it also has many functions. For example, if there is no gravity, everyone is a Hercules and can move all heavy objects from east to west and from south to north. In this way, we can easily transport heavy goods and save manpower and material resources. But there are also many shortcomings. If we lose weight for a long time, it will affect the blood transmission of lower limbs. If we don't take appropriate measures, it will lead to the lack of nutrition and even atrophy of lower limb muscles. So we must wear spacesuits to ensure our health. I really don't know what we will become then. Of course, we should study hard and overcome all difficulties, so that we human beings can survive well in weightlessness. If gravity suddenly disappears, it comes from the earth, and it is the attraction of the earth to objects that produces gravity. What would happen to the world if gravity suddenly disappeared? One day in physical education class, a PE teacher took his students to jump high, and a classmate began to jump up one meter away from the single frame. At this time, gravity suddenly disappeared, and the students jumped up and didn't land. At this time, an uncle is drinking tea at home. Tea has entered his mouth, but it has not flowed into his stomach. Hanging all the time, not being absorbed by the human body. In the evening, it rained strangely. It was raining, but it never fell to the ground. That's weird. Later, I learned that because the earth lost its attraction to objects, the rain did not fall to the ground. Without gravity, the spring dynamometer hangs an object, and there will be no indication on the spring dynamometer, and the pointer still points to the zero scale. Because gravity disappears, the object cannot bear the vertical downward gravity, so the object will not pull down the spring dynamometer, and the pointer of the spring dynamometer has no indication. If there were no gravity, all objects in the air would not fall to the ground, so it would be another scene, and I dare not imagine anything. If you lose gravity, are you surprised when you look up at these tall buildings, when you listen to the mountains and rivers rushing down the valley, and when the long-dried land suddenly comes to a timely rain? Are you surprised? The building stands in the clouds, why not fall down? Why don't the mountains and rivers in the mountain stream flow to the top of the mountain How can heavy rain fall on the earth? And so on. In fact, it is not surprising that all this is controlled by gravity, but what if all gravity is lost one day? No matter how hard the house is smashed, it will be uprooted, and the mountain spring will not flow down the mountain. People living under the mountain have no water to drink, and people can't walk smoothly on the ground. How terrible it was when all this happened! All the laws of life are out of balance. Can people continue to live on the earth? How does the flute play music? Musical instruments such as harmonica and huqin can play music, which is not surprising, because the reed and huqin in harmonica have strings, and they can emit various tunes due to different vibrations. But there is nothing in the flute. How can you play music? Sound is produced by the vibration of objects. The vibration of reeds and strings can produce sound, so can the vibration of liquid and gas. Although the flute is empty, there is an invisible air column inside. When this air column is excited by external force, it will vibrate and sound at a certain frequency. The longer the air column, the lower the frequency and the lower the pronunciation; Conversely, the shorter the air column, the higher the frequency and the higher the pronunciation. When people blow flat and narrow air from the mouthpiece and excite the air column in the flute, the flute makes a sound. If several fingers are pressed together, the longest air column will be formed in the flute and the lowest sound will be made. If the hole farthest from the blowhole is opened, the air column will be shorter and the sound will be higher. According to the needs of music, release or press different pressing holes, so that the duration of the air column is short and different sounds are blown out. Players can also use the method of "super blowing" to blow the sound eight degrees higher than the original sound. For example, the original do word, the same fingering, and the overburning playing method can pronounce the do word higher than the treble. Therefore, although the flute has only six holes, it can play beautiful music! Baidu found it. I think so.