AP Physics: Types of Mass
I wanted to revisit gravitational and inertial mass, so I got out the inertial balance and asked which type of mass a spring’s vibration should depend on. Finally, we used the motion detector to find the period with and without a string supporting the added mass and got beautiful results.

Afterward, students worked on some free-response problems in their groups. Tomorrow, they will get limited time with the scoring guides, then present their assigned problem.

Earth Science: Seismometers
Students built a very basic seismometer, then experimented with recording different types of earthquake waves. The results varied a lot, but it did lead to some good discussion on the limitations of the earliest seismometers.