What happens when 2 materials rub together? What happens if 2 Insulators and Conductors rub together?

-The Electrons will be Transferred from One to the Other -In the Conductor, The Electrons will just flow back into or out, making them Neutral -In the Insulators, The Electrons can not flow meaning a Positive Charge will be left on the Object that lost Electrons, and the Negative Charge will be applied on the Other Object, because it has Gained Electrons.