Day 71: Board Meeting, Practical, & Density Again

AP Physics: Board Meeting

Students whiteboarded their graphs from yesterday’s video. Once I had my 2nd hour find a class average for the slopes of their vertical velocity vs. time graphs, everything fell beautifully into place and there were even gasps when one student sketched a free-body diagram. In my other hour, a lot of groups skipped the directions for making the v-t graph and tried to take shortcuts that didn’t work, so I had to step in a little more. This reinforces my thoughts yesterday that I should have spent some time discussing the midpoint method.

pm graphs.jpg

Physics: Unbalanced Forces Practical

Students started a practical to predict the time it will take a cart to roll down a ramp given the cart’s mass and the ramp angle. For the first time, I had several students ask if I could just do a diagram or calculation for them, so I left the pen I usually carry at my desk and kept my hands in my pockets to avoid encouraging that.

ramp prac.jpg

Chemistry Essentials: Density Misconceptions

Today, I have students blocks of the same material, but different volume, and asked them to determine whether volume affects density. A lot of groups had trouble funding the volume with a ruler, rather than later displacement, so I should have spent a little more time on a pre-lab discussion connecting yesterday’s volume measurements to today’s.

density (1).jpg

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