No one pushed, no one pulled, why did Qiu Qian swell higher and higher?

Review expert: Luo Huiyue

Associate Researcher of the Institute of Physics of the Chinese Academy of Sciences

Speaking of Qiu Qian, everyone must be no stranger. Qiu Qian carries the joy of our growth and can always evoke our beautiful memories. With a piece of wooden board and two ropes, it can be leisurely in the air. However, do you know what scientific principles are when we are swinging thousands of autumn.

Source 丨 hippopx

Autumn Qian's Origin

Qiu Qian's history is quite long in China. In ancient times, our ancestors of the spiritual ancestors picked wild fruits, escaped or hunting the beasts in the trees or hunting the trees or crossed the gap in rock climbing and running. Foods in high places make Qiu Qian a primitive prototype.

The cultural relics at the end of Minos civilization show the appearance of the characters swinging

Source 丨 Wikipedia Encyclopedia

After long -term evolution and evolution, in the era of human civilization, early autumn has appeared in many places. This is reflected in many archeological studies. Wait. Swinging has gradually become a way of entertainment, and more and more styles. The sport of Qiuqian has gradually spread to the country and is welcomed by the people.

Source 丨 movie stills

During the Tang and Song dynasties, people's living standards gradually improved, and then the Qiu Qian movement evolved into a holiday carnival project and entertainment medium. The Qingming Festival is also known as the "Autumn Festival", and some legends believe that swinging thousands of diseases can be driven out of all diseases.

The people of the people also went out of the countryside and set up autumn Qian with bamboo, so they danced and played. Nowadays, Qiu Qian has a history of thousands of years in Huaxia. It has witnessed the rise and fall of the dynasty, and also left a national brand. Qiu Qian has developed into an incarnation of art, integrating function and entertainment, and gives many aesthetics, making people pleasing to the eye without losing interest.

Qiu Qian is a physical phenomenon

Qiu Qian can actually be regarded as a simple mechanical system. There are two external forces it suffer: one is vertical and downward gravity; the other is the binding force in the direction of the autumn thousand ropes. The easiest way to play Qiu Qian is sitting on the Qiuqian board, waiting for others to push hard. At this time, the movement of Qiu Qian is similar to the motion of the single spread, but because the air resistance and friction resistance will hinder the swing of Qiu Qian, the amplitude of the swing will become smaller and smaller until it stops.

If a person is continuously pushed by an external force at this time, the Qiuqian will become higher. When Qiu Qian dangles to the highest point, apply an external force in the direction of Qiu Qian's continued swinging, and you can push Qiu Qian higher; but if you apply a force that is opposite to the direction of the autumn thousand movement, at this time The height of autumn is reduced.

When we are swinging thousands of hours, there will be a short sense of weight loss in the process of swinging down, and we may feel nervous and fear. When the Qiu Qian wanders higher and the rapid swaying, the human body is affected by the centrifugal force, and the lower abdomen feels slightly oppressed. There will be a feeling of wanting to urinate. In the process of swinging thousands, constantly overcome tension and fear, which can enhance self -control ability and help physical and mental health. In addition, people who often swing thousands of autumn are rarely dizzy by car or boat.

How can the autumn be higher and higher?

How to keep Qiu Qian's swinging and swinging higher without relying on the ground power is the goal that everyone who participates in the Qiu Qian movement.

Observing thousands of hours, we can find that those who are swinging are higher and higher, and they always have the action of standing up or squatting. At this time, although there is no external force, the actions that people do actually increase the system energy. Therefore, when considering resistance, as long as the energy of the human body is transformed into mechanical energy is greater than the energy consumed by overcoming resistance, autumn thousands will become higher and higher.

Source 丨 Baidu Encyclopedia

The center of gravity of the human body and the autumn system can be simplified into a mass point. The center of gravity changes with the changes in the posture. When the knee flexes, the center of gravity is low, and the center of gravity is high when the legs stand up. Qiu Qian is at a high place. If people are standing, the center of gravity is the highest, the gravity is the largest, and the momentum is the smallest.

In the process of returning from a high place in Qiuqian, people began to squat, and the center of gravity moved down. The gravity potential energy of the entire system was continuously transformed into kinetic energy, and the speed was getting faster and faster. The fastest, the kinetic energy of the system has reached the maximum and the gravity potential energy is the smallest. If this process does not have squatting, the increase in the power of the system will not be so large, but it will continue to lose due to resistance.

Source 丨 PEXELS

In the process of Qiu Qian from the lowest place, people began to stand quickly, so that the center of gravity increased, the potential energy increased, and the speed of the momentum was slowed down. The total system of the system was actually increased. high. This is because the human body consumes its own energy to overcome gravity, so I feel that the legs and feet are very hard, and it will be fatigue over time.

As shown in the figure below, the process of swinging thousands of autumn is regarded as a single lecture movement. The red area is the first half and the blue area is the second half. By changing the state of its own state, the corner of the second half High, its energy comes from the merits made when putting on the leg.

Summary of the Swing Qiuqian Movement Process Source 丨 Network

From this point of view, swinging Qiu Qian also has to master the method. During the autumn swing, the knee flexed and squatted to reduce the center of gravity. During the upper swing process, the kick stood up to raise the center of gravity, which can make the Qiu Qian swing higher.When you swing thousands of times, you must hold the rope with both hands, and force it with the upper and lower swing. The whole process mainly relies on the strength of the waist, legs and hips to achieve the upper and lower swing.Qiu Qian has a long history, and its structure is simple but contains rich physical knowledge.In Chinese culture, Qiu Qian also pinned the beautiful meaning of health and happiness.Let us swing again after studying and work, wandering around, wandering, and laughing back.

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