Longhu Network News Jinling Evening News Reporter Walking in the drizzle holding an umbrella, if such a thing happened in novels or TV, it would definitely have a special poetic quality. However, in real life, many people will complain endlessly if they walk on a rainy day. "Every time it rains a little harder and there is some water on the ground, I will definitely shake the mud on my trousers, which will make people look extremely embarrassed." Ms. Chang, who works on Changfu Street, told reporters. Because of this matter, Miss Chang had a lot of headaches. "Wear dark-colored pants. The mud spots are hard to see when they are first splashed on, but once they dry, you will see spots on the trouser legs. Wear light-colored pants, as the mud spots will be more conspicuous."
Small survey
7 of the 20 citizens have clean trousers
The strange thing is that not everyone will be splashed with mud when they walk on a rainy day. Why? How should I walk to avoid this embarrassment?
The reporter randomly interviewed 20 citizens yesterday. Among them, 7 people said that their trousers would not be splashed with mud when walking on rainy days. The rest of the people will have similar problems to a greater or lesser extent. Among them, citizen Mr. Zhang is the most troubled.
“Every time I walk, it’s not just the mud spots on my trousers, my pants are basically covered with mud spots from my thighs down. So, when it rains, I try not to walk outside. , otherwise it would be too embarrassing." Mr. Zhang said that since he began to realize this problem, he has been particularly envious of those who walk with clean trousers on rainy days. "I don't know what secrets they have for walking." Of course, Mr. Zhang said that this was not the most miserable thing for him. He once met someone who was more powerful than him. He could even throw mud spots on his back every time he walked.
Small experiment
"Being pigeon-toed" and "wearing high heels", are these useful?
During the interview, the reporter found that there are many opinions on how to walk without splashing mud. Some people recommend pigeon-toed posture, while others say that wearing high heels will prevent the body from being splashed back. Are these methods effective? In order to solve this very common but confusing "problem" in life, the reporter specially conducted several small experiments.
Experiment preparation:
It rained not too heavily in Nanjing from the afternoon to evening the day before yesterday. At noon yesterday, the reporter found a relatively low-lying road section on Ruijin Road that still had a certain amount of water accumulation, and conducted this test by simulating the road conditions with slight water accumulation in the rain.
In addition, the reporter also prepared 8 pieces of white cloth.
Experimental process:
Jinling Evening News reporter Gao Yang, who was wearing flat shoes, tied two white cloth strips to his left and right calves respectively to simulate trouser legs. Gao Yang walked back and forth four times on this waterlogged road without getting a single splash of mud on his trouser legs.
Then another reporter from Jinling Evening News, Shi Tingting, appeared, also wearing flat shoes and tied with white cloth strips on her trouser legs. As a result, after just two steps, the white cloth was already splashed with mud. After walking back and forth three times, the two white cloth strips were already in terrible shape and covered with mud spots.
Shi Tingting put on high heels and two clean white strips of cloth. After walking back and forth for only one round, Gao Yang shouted from the side: "It really works. So far, there is not a single mud speck. It's clean." The reporter walked back and forth for three full times wearing high heels. After taking off the cloth strip, he found that only the left There are very few mud spots on the fabric strips of the feet.
Finally, Shi Tingting changed back to flat shoes and two pieces of white cloth, and started walking in the "inner-shaped" way. Not to mention, the pigeon-toed walking method is also effective. The cloth strip on the right foot did not splash any mud, and there was only a little mud on the back of the left foot. However, this way of walking pigeon-toed is really a bit tiring, and the reporter is very unaccustomed to walking.
Experimental data:
Gao Yang walks normally: not a single mud spot;
Shi Tingting wears flat shoes and walks normally: 13 large mud spots and 9 small ones Mud spots;
Shi Tingting walks in high heels: 2 small mud spots;
Shi Tingting walks in flat shoes: 2 big mud spots.
Experimental results:
Gao Yang walked in his usual way without splashing mud, while Shi Tingting tried three ways to walk, walked in her usual way, and the white cloth was covered with mud. It’s mud spots, but wearing high heels and walking with pigeon-toed posture means almost no splashes. It seems that friends who tend to splash muddy water on their trousers when walking on rainy days can try walking with pigeon-toed figures or wearing high heels.
Physics teacher: The center of gravity is farther back to avoid splashing
Similarly walking in the same way as usual, why did Shi Tingting shake mud spots on her trousers, but Gao Yang didn't? Gao Yang said that she thinks this is a problem with the way she walks, "I always land with my heels first, so it is not easy to throw mud and water onto my trouser legs."
Many netizens have discussed this issue on the Internet. However, the specific reasons are as follows:
1. The theory of center of gravity. If the center of gravity is slightly forward when walking, this method will definitely splash muddy water on rainy days. If the center of gravity is slightly backward, muddy water will not splash. Wearing high heels is not easy to splash because the center of gravity is backward.
2. Posture theory. If you have an inside-out posture, you will definitely not get splashed. If you have an outside-in posture, you can throw the muddy water on the ground onto other people's buttocks.
3. The theory of gravity.
The main reason for mud splashing is that when walking, the back heel is too light when it is lifted off the ground, and the mud in close contact with it will fly off the ground with inertia.
Are these claims scientifically based? The reporter interviewed Zhang Wenli, a physics teacher at the High School Affiliated to Nanjing Normal University.
"To understand why muddy water splashes on trouser legs, we must first understand why the water moves upward." Teacher Zhang told reporters that the center of gravity theory makes sense, "The reason why the water flows upward is because There is an upward speed. This upward speed is caused by the upward movement of the heel. If you see an athlete running, the center of gravity is tilted forward. The front foot is exerting force and the back heel moves upward. This will definitely splash muddy water. If the back heel touches the ground first, The water will not go up, so the trousers will not be stained easily."
Why don't you get splashed with mud when you walk inwards? "When walking pigeon-toed, the soles of the feet are not that sharply bent and are almost flat, and the inner edges of the feet touch the ground first, so the water will not move upward." Teacher Zhang explained.
Teacher Zhang said that if you want to avoid splashing muddy water on your trouser legs when walking in the rain, the best way is to walk slower and touch the ground with your heels first. “When you walk fast, your center of gravity will naturally lean forward slightly.
"Reported by Jinling Evening News reporters Shi Tingting and Gao Yang