Grouping: Pairs
Take-home: Working seismograph
Key ideas: Inertia, relative motion, recording, amplitude.
Start with: Hold a hanging mass while moving its frame to show relative motion.
Success check: Produce distinguishable traces for gentle vs strong shaking.
Try changing: Mass; string length; pen pressure; shake amplitude.
Preparation: Make one stable demo; cut paper strips.
CNC preparation: Cut frame panels/slots.
3D-print preparation: Print pen holder or hanging mass cup.
Lesson flow: Day 1: build
Day 2: create/test traces
Video:
How to Make a Seismograph
Safety and cleanup: Use washable markers; secure hanging masses.
https://www.sciencebuddies.org/stem-activities/make-a-seismograph
https://www.youtube.com/watch?v=41RzGwZINOk