In the evening, I did an interesting and meaningful experiment. At first, I found a blank piece of paper, tore it into countless small pieces and put it on the table. Then I rubbed my hair hard and repeatedly with a ruler, but the little pieces of paper stopped moving when I sucked them. I'm particularly surprised. Hey, why can't I smoke it? Later, I found that the ruler was lead, and I realized that the problem was here.

So, I changed a plastic ruler, rubbed my hair hard and repeatedly, and then put it about 2 cm away from the table. I saw those little pieces of paper rushing to the plastic ruler and sticking to it. Naughty elves seem to be climbing up and down. I moved the plastic ruler again, and some of the original small pieces of paper jumped down, but the small pieces of paper that had not been sucked up just now were sucked up. I think: maybe the static electricity has weakened! Some small pieces of paper are sucked out from the plastic ruler one by one, like smart and lively little caterpillars. Some small pieces of paper seem to be not interested in plastic rulers, and they are lazily placed on the table. After a while, there were not many pieces of paper left on the plastic ruler, and they all jumped down slowly from the plastic ruler. I watched the naughty elves carefully for fear that they would run around. I rubbed my hair hard over and over again, and when I tried to suck it again, the little piece of paper stopped moving. I think the rubbing time is too short, so it won't generate static electricity and suck up the scraps of paper.

Through this experiment, I learned that rubbing plastic objects repeatedly in sweaters, hair and other places will produce static electricity, which will attract small pieces of paper. This is the phenomenon of triboelectrification.