We reviewed the rules of attraction and discussed the different lab activities that we have done over the past 3 days that change the charge distribution of an object. The list looked a lot like this:
Rub a balloon on your hair
Rub fur on a seat
Hold the electrophorus over the charged seat
Stick a balloon to the wall
Rub the PVC rod with fur
Rub the lucite rod with plastic
Pull apart 2 pieces of scotch tape
Once students generated a list, I then asked the to group or categorize them. We concluded that of the activities we have seen, they represent charging by friction, charging by induction and polarization. I told students there was another way to charge that we haven't seen yet, which led to the Van De Graff generator demos. With about 25 minutes left in the period, I gave time to work on WS 2 and we corrected it in class.
HW: finish and correct wS 2; study for quiz on WS 2 and VDG demos
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