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 do we start? The car skidded before it started, or it couldn't stop when it started. There is no force to hinder its movement, but 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 start the plane.
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. You can't pick up a pen if you want to write. Pen can't rub paper to write. You can't take chopsticks if you want to eat. If you want to drink, you can't even lift the cup. 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 anything, because without resistance, everything 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. In a rage, you want to throw away the computer, but you slide out far away and never come back.