At this point we have seen two types of behavior. In the first case, we saw the tapes repel each other. In the second case, we saw them attract. Press two tapes onto the hard surface and label them B for bottom. Press a second tape onto each of the first two and label them T for top. Pull up the tapes rapidly and then separate them. Of the four tapes you have made, find which ones attract each other and which ones repel. 8) Describe your results When we pull up the tapes rapidly, they acquire a very small net charge. If the tapes are prepared in the same way, then they acquire the same type of charge. We learn about charge because of the forces exerted by the charges on each other. 9) Explain, giving specific evidence, how the series of observations you have made show that there are two types of charge. 10) Explain, giving specific evidence, how your observations demonstrate that like charges always repel and that opposite charges attract.