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UM A5 Video Clip 1: Group 1 works through Exploration #2
Group 1 works through the first three steps of Exploration #1; they investigate whether a nail can be magnetized by holding it near one pole of a bar magnet. They are initially surprised at the result because they predicted that nothing would happen due to the lack of contact. Amy starts to use the class consensus model to explain the results. But the others in the group decide that stating the nature of the material as ferromagnetic is sufficient.
UM A5 Video Clip 2: Group 3 works through Exploration #2
Group 3 works through the first three steps of Exploration #1; they investigate whether a nail can be magnetized by holding it near one pole of a bar magnet. The results agree with their predictions. Though it is not stated clearly they do seem to be basing their reasoning on the 'tiny magnets' model.
UM A5 Video Clip 4: Groups present their Explanations from Exploration #3
Three groups present their explanations for why the middle of a bar magnet seems to be much weaker than the ends. All three groups use the tiny magnets mode; but they have slightly different reasoning. The first group bases their reasoning on the plane of the alignment of the tiny magnets. The second group states that there is no definite pole in the middle and that a paperclip would be pulled equally toward both ends. The last group argues that the poles of the individual tiny magnets cancel each other out in the middle.
UM A5 Video Clip 1: Group 1 works through Exploration #2