These days, we have studied mechanics, which is a magical field. The friction force is studied, and the factors affecting the sliding friction force are known: the roughness of the contact surface; Stress. But I suddenly remembered a phenomenon in my life: when mopping the floor, I always feel that my hands and mop poles are very dry, and sometimes my hands can't catch the mop poles, so mopping the floor is very difficult. At this time, I am always used to getting some water on my hands, which can increase the friction and better hold the mop pole. And what does the water in it rely on to increase friction?
After learning this lesson, I can't help asking a little question mark in my mind: Is it by increasing the pressure? Absolutely not! I set a strong grip to change the roughness of the contact surface? I seem to be hesitant. It seems that water can change the roughness of contact surface, but how? I was a little confused, so I asked the teacher. I didn't expect this to confuse the teacher, so she asked me if there were other factors. And I've been thinking about it for a long time, and I'm not sure. So, I went home and immediately moved out of the reinforcements-"Baidu".
After I asked the question, many answers were posted immediately. I looked at it excitedly. Oh, my God! It really has everything, even rheumatism and osteopathy! Therefore, while scolding this netizen who only cares about rewarding right and wrong, I eagerly look forward to a new answer. ...
While I am expecting the answer, I am also thinking about the answer: Will gears with mismatched teeth slip like gears, and adding water will increase the friction like running-in agents! But there is no water between the hand and the mop handle! I have to think about it again ... so, I am thinking about class, class, eating and sleeping! Just like when Archimedes thought about the law of buoyancy (Archimedes principle)-if I go on like this, I will become a "thinker"!
Finally, a few days later, there was a new answer. I clicked the answer. It is said that water has adsorption, right? Adsorption? What? Water is equivalent to adhesive. Stick a mop on your hand? This question seems a bit difficult for me, a novice in mechanics! So, I told the teacher that the teacher thought it was possible, but it seemed wrong again. It should not be like this. ...
It is such a common problem that I have been thinking about for months. We dig deeper and deeper, and it becomes more and more interesting. I seem to enjoy it, too
Another weekend, I thought of this problem again. I was suddenly inspired to sort out the clues: when mopping the floor, if you want to hold it firmly, you have to stay still on the mop. That-it should not be sliding friction, but static friction! Yes! This is a mistake! It should be considered from static friction! Because we didn't learn static friction, I asked again, and now I have a different answer. ...
"I don't think it is adsorption, but it is related to pressure. For example, after wiping water on your hands, you can see that countless "Madeborg hemispheres" are formed on the water, hands and mop bars, and your hands are "sucked" to a certain extent, which makes people feel that the friction is increased subjectively. "
-A netizen
After reading this answer, I became more and more interested, because the principle of the Madeborg hemisphere is similar to some suckers on the wall, which can prove that the atmospheric pressure is large. This is the field of atmospheric pressure. From a simple question, I have derived so much knowledge, but I personally feel this, right! Ask the teacher next week!
After this exploration, I like to taste Longjing tea-the more I drink, the more fragrant it becomes! Science is like a gold mine. Inside, I will try my best to explore and repair this gold mine. This will definitely make me find pleasure in exploration and learn in fun, which will definitely be my motivation to move forward.
I love science!