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USE L1 Video Clip 1: Group performs experiment
The group prepares a T-tape and B-tape and then brings some materials nearby and observes attraction. [It probably would have been better if the tapes were a little shorter and if the objects were brought near the middle of the held tapes.]
USE L1 Video Clip 5: Class discusses charge on acrylic sheet
Class answers the making sense question at the top of page SE-8: does rubbed acrylic has same charge as B tape or T tape? Two students argue that it was the same as the T-tape because the rubbed acrylic repelled the T-tape. A third student then claims it was the same as the B-tape since the acrylic attracted the B-tape. A fourth student supported the argument that it was the same as the T-tape and most of the class seemed to agree with that (by show of hands).
USE L1 Video Clip 6: Group discusses SQ #2
Group briefly discusses SQ #2: what would happen if two acrylic-rubbed Styrofoam plates were brought together. They decide the two plates would repel each other since they were rubbed the same way (with the acrylic). They realize that they do not know whether the plates were + charged or – charged but their answer would still be the same regardless of the type of charge.
USE L1 Video Clip 7: Group discusses SQ #3
The group discusses CQ 1-5: what happens when two objects are charged by rubbing or peeling. In the version of the materials this group had there were actually four choices. Choice C on the current version was actually choice D on the previous version. [Choice C on the previous version was: "Both objects have both types of charge but each type is in a different location on the object.' That choice doesn't appear on the current version.] Different students in the group support either choice B (one object has only one type of charge and the other object has only the other type of charge) or choice D (which is now choice C).
USE L1 Video Clip 1: Group performs experiment