People can dance on the stage under the light. Can small pieces of paper dance on the plastic board with the accompaniment of music?

Let's do a little experiment. First, we prepare some pieces of paper and a plastic stick, put the paper on the table, rub the plastic stick back and forth many times, and then immediately suck the paper with the rubbed plastic stick. At this time, a miracle appeared. Paper put on beautiful clothes and began to dance. Why?

In fact, this is the role of static electricity. How did static electricity come from? Originally, all substances were made up of molecules, and molecules were made up of atoms. In atoms, there are negatively charged electrons and positively charged protons. Under normal circumstances, the number of protons in an atom is the same as the number of electrons, so it is not charged. Electrons surround the nucleus, and once they are subjected to external force, they leave the orbit and invade other atoms B. Atom A is positively charged due to the lack of electrons, which is called cation, and atom B is negatively charged due to the increase of electrons, which is called anion. The reason for the uneven distribution of electrons is that electrons are off track by external forces, which contain various energies (such as kinetic energy, thermal energy, chemical energy, etc.). ). Any two objects of different materials can be separated after contact, and static electricity can be generated, which is called triboelectrification.

In daily life, we often encounter this phenomenon in dry and windy autumn: when we take off our clothes and sleep at night, we often hear crackling sounds in the dark, accompanied by blue light; When you meet and shake hands, as soon as your fingers touch each other, you will suddenly feel a sharp pain in your fingertips, which is shocking; When I get up in the morning to comb my hair, my hair tends to "float", and the more I manage it, the more chaotic it is. When you pull the door handle and turn on the tap, you will get an electric shock, and you will often make a "bang, bang" sound. This is static electricity generated in the human body, some of which will cause harm to the human body.

Knowing the principle of static electricity, we can try our best to avoid its harm to people, and we can also use this principle to manufacture machinery and equipment to serve people.