Day 126: Universal Gravitation, Pendulums, & Quiz

AP Physics: Universal Gravitation

We discussed the results of the universal gravitation lab today. Once we got the inverse-square relationship, students quickly recognized the slope of their graphs seemed to be connected to the stellar mass. Prior to class, students entered their slopes and stellar masses into a spreadsheet, so I projected the data and sorted it to confirm the biggest slopes went with the biggest stellar masses. I also graphed students’ slopes vs. stellar mass to get a pretty good value for G.

chart (1)

Physics: Pendulums

Students whiteboarded some problems from yesterday connecting pendulums to other models we’ve used so far this year, including momentum, forces, and energy. A few students needed some reminders, especially about the direction of tension forces, but were very successful in the end.

pend wb.jpg

Chemistry Essentials: Quiz

Students took a quiz on molar mass and balancing equations for chemical reactions. Based on a quick glance at their work and input from the para who worked with special education students on the quiz, I think I’m going to see a bi-modal distribution. I’m planning to start stoichiometry, and need to think about how I’m going to support the students who are still struggling with molar mass and balancing reactions when we are starting to use those skills together.

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