**AP Physics: p-t Graphs**

Students sketched momentum vs. time graphs for bowling balls hit with various combinations of taps, then we got out billiard balls and motion detectors to transition to true momentum vs. time graphs. It was a little tricky for students to predict what the graph would look like when the billiard ball reversed direction, but we got there by the end of the hour.

**Physics: Groupwork Reflection**

Today we had a few whiteboards to finish from Friday and a quiz to take. One of my goals this year is to improve the quality of the collaboration in my classroom, so we also took a few minutes to talk about some of the different abilities students needed to complete the problems and mistakes whiteboarding, then I asked students to complete a short reflection based on a list of things effective groups do I got from Scot Hovan at a modeling workshop. I haven’t had a chance to read the reflections yet, but it looked like students were giving it some good thought and I overheard several students showing their reflection to a peer they’d used as a positive example.

**Chemistry Essentials: Density**

We got out the metal dowels from last week’s volume lab to find their density. I asked groups to design their own experiment, and wished I’d taken the time for a little more discussion on what makes a good experiment. The worksheet I used started with questions about what variables they needed and how to measure those variables, but a lot of students had trouble with articulating how they would get a variety of values for the data table.

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