Here's why:
* Friction and Electron Transfer: When two surfaces rub against each other, the force of friction can cause electrons to be transferred from one surface to the other.
* Net Charge: If one surface loses electrons, it becomes positively charged (more protons than electrons). If the other surface gains electrons, it becomes negatively charged (more electrons than protons).
* Static Electricity: This process of charging by friction is called triboelectric effect, and it's the principle behind static electricity.
Let me know if you'd like to know more about triboelectric effect or static electricity!
