We’re exploring how waves behave at fixed or loosely-held boundaries. I had the kids hop on to their first PhET sim to see the results. All told, about 10 minutes of diversion and lots of silliness surrounding making crazy waves. Before sending them off on their computers, I asked the kids to predict how an upright incident wave would reflect off a fixed boundary. Then I sent them to the PhET to figure it out for themselves. Repeat for loose boundary.
Also, I liked our warm-up problem today, from Ranking Task Exercises in Physics:
As a class, we’re working on writing good justifications for our rankings. It’s always tough to get teenagers to explain why they solved a problem the way they did, so I’m giving regular ranking tasks with justification to attack the problem.