USE A5 Video Clip 1: Group 3 discusses the Initial Ideas questions

USE A5 Video Clip 1: Group 3 discusses the Initial Ideas questions

The group discusses how a pair of + and – charges can be arranged to attract a charged puck. They seem to base their thinking on an earlier homework assignment in which they saw that the strength of attraction/repulsion depends on the distance between charges.

USE A5 Video Clip 2: Group 3 discusses STEP 2 of Exploration 1

USE A5 Video Clip 2: Group 3 discusses STEP 2 of Exploration 1

The group discusses how a large group of + and – charges could be arranged to attract a charged object. They start by thinking about arranging one type of charge in a circle on the 'outside'. Vicky then suggests an analogy with magnets which prompts April to suggest an alternative arrangement in which pairs of + and charges switch sides. Erin suggests a 'wrinkle' arrangement (concentric circles of alternating charge) but the group does not discuss it further. They finally settle on their first idea.

USE A5 Video Clip 3: Group 3 works on STEP 2 of Exploration #2

USE A5 Video Clip 3: Group 3 works on STEP 2 of Exploration #2

At first the group is not sure the positively charged puck will have any influence on the negative charges in the metal object but eventually decide they would move slightly toward the puck. They try this arrangement in the simulator and attribute its attraction of the puck to the relative closeness of the negative charges.

USE A5 Video Clip 4: Group 3 discusses narrative paragraph defining polarization at end of Exploration 1

USE A5 Video Clip 4: Group 3 discusses narrative paragraph defining polarization at end of Exploration 1

The group discusses the difference between 'neutral' and 'polarized'. They realize that this idea is similar to the magnet analogy Vicky suggested at the end of Exploration #1.

USE A5 Video Clip 5: Group 3 discusses Summarizing Question S1

USE A5 Video Clip 5: Group 3 discusses Summarizing Question S1

The group has some doubts as to whether the metal object will move toward the puck but quickly rationalize that it will based on the relative closeness of the negative and positive charges to the puck.

USE A5 Video Clip 6: Class discusses Summarizing Question S1

USE A5 Video Clip 6: Class discusses Summarizing Question S1

There is some disagreement between groups as to whether the metal object would move toward the puck. Some argument for it not moving is based on what was observed in the simulation but Nancy (off camera) suggests that it is simply a case of whether it can be assumed that the attraction is strong enough to move the object or not.

USE A5 Video Clip 7: Group 3 prepares a presentation board for Summarizing Question S3

USE A5 Video Clip 7: Group 3 prepares a presentation board for Summarizing Question S3

In preparing a whiteboard for the class discussion the group rethinks their way through the scenario and come up with a more appropriate diagram and explanation.

USE A5 Video Clip 8: Three groups present their explanations for Summarizing Question S3

USE A5 Video Clip 8: Three groups present their explanations for Summarizing Question S3

All three groups present reasonable explanations. Although the first group had shown moving positive charges in their diagram Paige corrects this in her description.