Tomorrow I have to do a demo in physics regarding static electricity. I am going to rub a comb against the inside of my sweatshirt and then attract tissue paper to it. I don't understand how to explain why this happens. Is the comb neutral at first, then when you rub it to the sweatshirt it gains electrons and has a negative charge? Is the tissue paper a positive charge because opposites attract? Please explain this to me if I am wrong. Thanks!