1. The problem statement, all variables and given/known data When I rub an object against another object, will the electron transfer always be fixed? As in, the object from which the electrons flow will always be the same object or will the objects swap roles? Why? 2. Relevant equations No equations required for answering this question. But if there are any please point it out to me! 3. The attempt at a solution I always had the idea that it was due to the material of the objects that decided the flow of electrons. For example, a comb and silk.