Jimu news reporter Li Bowlong wang Yongsheng
Intern Taos Micro
Correspondent Xu Yali
Video clip Lee Bowl Rong
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Want to know how Gu Ailing used the volley height and fast body rotation to complete the 1620 super difficulty action to win the gold medal? On February 10th, the Mathematical World Exhibition Hall of Hubei Science and Technology Museum invited Professor Pan Chunxu of the School of Physics of Wuhan University to explain the physics knowledge in ice and snow sports to the tourists, and he used the exhibits in the venue to conduct simulation experiments. On the occasion of the warm winter Olympic games, citizens and friends explore the mysteries of science and share the joy of science and technology.
The scene of the event
On February 8, in the final of the freestyle ski women's big jump, Gu Ailing jumped from the high platform and completed a super difficult two-week flip body of 1620 degrees, winning the gold medal in one fell swoop. How Gu Ailing used volley height and rapid body rotation to complete this action. At the Hubei Provincial Science and Technology Museum, Pan Chunxu used the exhibit "roller coaster" in the exhibition hall to explain the physical knowledge. The shape of the exhibit "roller coaster" is similar to a miniature version of the roller coaster track, the track is composed of several U-shapes and O-shapes, and the U-shaped track part is similar to the Shougang Ski Jump. In order to simulate the skiing scene, the exhibition hall administrator put the ball down from the starting point, only to see it rolling and sliding rapidly in the track, and the children on the scene were wide-eyed to observe the movement of the ball.
Pan Chunxu pointed out that the small ball rolled out can simulate the movement process of skiers. He introduced that Gu Ailing started from a high place in the final of the big jump platform, when the gravitational potential energy was converted into kinetic energy, and the high movement speed was obtained, so that she could jump higher and fight for enough time to complete the two-week flip body. In addition to the role of potential energy, the athlete's own physical flexibility and increased moment of inertia of rotation will also greatly determine the speed of rotation, which in turn can rotate more laps.
Pan Chunxu explained
In skating, athletes like to follow suit, forming a "triangle" formation, which involves knowledge of resistance in physics. In the competition, skaters encountered mainly air resistance, in order to make friends on the scene better understand, Professor Pan used the exhibition hall exhibit "fluid resistance" to tell everyone. Six iron columns are erected at the upper end of the exhibit, and six rubber plates of different shapes are embedded at the lower ends of the six iron columns. Press the start button and water will flow to the tape. Pan Chunxu guided the children on the scene to turn the rubber plate and change the surface area of the rubber plate to meet the water flow. The children observed that the sharper the surface of the rubber plate, the faster the water flow. Pan Chunxu explained that the speed of water flow actually reflects the size of the resistance. "The larger the surface area of the glue plate to meet the flow of water, the greater the resistance it will receive. When the water flow is met with a sharp surface, the force area is reduced, and the resistance is relatively reduced. Pan Chunxu said. Therefore, our common skaters' hats and clothes will use a tight streamlined type.
Pan Chunxu added that air resistance still has a greater impact on players. He quipped that during the skating competition, the players would skate together, and the skaters in the front might not get the first place. Because the player who skates in the front of the game has the greatest resistance and consumes more physical strength; the player in the back preserves his strength and has a greater chance of winning. In the short track speed skating mixed team relay final, the Chinese team tacitly cooperated to win the first gold for China.
Do an exchange in front of the centrifugal force booth
In competitions, speed skaters are accustomed to leaning inward when cornering, with their hands on the ground. Pan Chunxu pointed out that this is actually to combat the effect of centrifugal forces. The "centrifugal force" exhibit in the exhibition hall consists of a rectangular container filled with blue liquid below and two inclined cylindrical containers above. The cylindrical container is also filled with blue liquid and placed in two small balls of varying weights. After the model starts the accelerated rotation, the blue liquid in the lower layer is in a U-shape of high and low on both sides, and the heavy balls in the upper layer that are larger than the specific gravity of the blue liquid fly to the highest point of the cylindrical container, and the small balls that are lighter than the specific gravity of the blue liquid fall to the lowest point of the container. Through this experiment, Pan Chunxu revealed the principle that the larger the mass, the greater the centrifugal force.
Pan Chunxu's patient and detailed explanations and interesting and vivid exhibits in the Science and Technology Museum gave a valuable lesson to the citizens and friends. "I think I learned a lot of interesting physics today, and I also know that there is a lot of physics in movement." Wang Zihao's children excitedly said that he benefited a lot today. Wang Zihao's mother also said that she was also inspired, "It turns out that in our daily life, like watching the Winter Olympic Games, we can cultivate children's interest in learning and develop children's hands-on and thinking ability." ”
Pan Chunxu emphasizes the importance of physics learning by comparing physics to the foundation of architecture. He called on the majority of young people to actively excavate the physics in life, just like watching the Winter Olympics can find a lot of physical mysteries. "We have to see physics in life and associate life in physics."
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