Charge: if two insulating materials rub agaisnt each other, electrons are rubbed off one material and depostied on the other. The material which gains electrons then becomes negativley charged, becuase electrons have a negative charge, and the material which then loses electrons has a positive charge. Which one gains or loses electrons depends on the materials used.
An example of this would be rubbing a dry cloth on a polythene rod. Electrons are transferred from the dry cloth onto the polythene rod, if the same cloth is then rubbed against a perspex rod, the electrons from the perspecx rod would move onto the dry cloth, making it have a negative charge once again.
Like charges repel and opposite charges attract and the bigger the distance between the forces, the weaker the force is.
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