[Only two students from this group were present for this activity.] The two students in this group discuss the two questions in the Initial Ideas section. They think about their previous experiences with static electricity and wonder how it is that people can be involved.
After a clicker question shows the class almost evenly split on their thinking for the second question in the Initial Ideas questions two groups give their reasoning. Group 3 bases their thinking on the idea that static electricity always seems to produce the same effect. By contrast Group 5 thinks about the different poles on a car battery and uses this to infer that different things might happen.
Group 3 checks whether the interaction between charged B and T tapes depends on their orientation and conclude that it does not since they always see attraction. They then watch a video of two charged stirrers interacting and see that they always repel each other regardless of their orientation. From these results they conclude that charged objects are one ended and that a single charged object only has one type of electric charge all over it.
Group 3 checks how two pairs of charged tapes interact with each other. After seeing a pattern develop Mary becomes uncertain of their very first observation.
In attempting to redo the experiment they discover a possible flaw in their procedure. They check with a neighboring group and then repeat the experiment again. This time they see what they expect. The use these results to infer that there are two types of electric charge because they saw both attraction and repulsion.
Group 3 checks how a rubbed balloon interacts with a pair of charged B and T tapes. From their observations they argue that the balloon must have the same type of charge as the B tape since it repels that and attracts the T tape.
Two groups note a similarity between magnetism and static electricity in that they both show attraction and repulsion. However they also note differences; different materials are involved and also that magnetized objects are two-ended whereas electrified objects are one-ended. Because of these differences they conclude that the two interacts are different from each other.