Friction is a very common phenomenon, and there are many examples of friction in real life, such as friction when grasping objects, friction when driving belts, friction when fixing nails on the wall and so on. But friction can also bring trouble to our daily life. For example, when the machine is running, the friction between sliding parts wastes power, which will also wear the parts of the machine and shorten the service life. We sometimes hope that there will never be friction on the earth, but if there really is no friction, what will happen to people's lives?

First and foremost, we can't move. There is no friction between our feet and the ground, so people can hardly move. Bicycle wheels and the ground are smooth, how to start? The car skidded before it started, or it couldn't stop when it started. There is no force to hinder its movement, it can only slide down indefinitely, and finally it collides with other cars, causing traffic accidents one after another. Neither piston engine nor turbojet engine can be started.

Second, you can't find anything. We can pick up things by friction, which comes from the concave and convex of the object itself and the fingerprints on our hands. Good, the object is smooth, and we don't have fingerprints. If we want to pick up something, it doesn't work with it. We can only be anxious. Not only can't you pick up things, but you can't even do a series of forces. Life is full of difficulties. If you want to write, you can't pick up a pen, and the pen can't write on paper. If you want to eat, you can't even hold chopsticks. If you want to drink water, you can't lift the glass. Want to wear clothes but can't afford to wear them; I want to work, work, but any tools fall out of my hands again and again. ...

Third, the most terrible thing is that the earth will not be able to support any object, because without resistance, any object will be inserted into the ground under the action of gravity.

Finally, you can't see this post, because without friction, you can't lift the mouse, roll the wheel or pull the joystick. You want to throw away your computer in a rage, but by your own efforts, you slip far away and never come back.

Haha, I wish the landlord a higher learning level.