More "There Are Two Types" Activities as Examples of NGSS Based Practices

Inspired by Professor Richard Gelderman’s interactive classification activity at the 2025 AAPT Winter Meeting, this workshop will engage participants in a hands-on approach to exploring NGSS-based science practices. Gelderman’s original activity challenged participants to classify vials of liquid based on an unknown rule and then determine the classification criteria of another group. In this workshop, we will adapt this engaging strategy using laminated diagrams of physics phenomena. Participants will collaboratively classify diagrams of either electric circuits, waves, or moving cars into two distinct categories based on observable patterns. After initial classification, groups will rotate and attempt to deduce the classification rule established by another group, fostering scientific argumentation and pattern recognition. This activity encourages deeper conceptual understanding, models the NGSS Science and Engineering Practices, and provides a low-barrier, high-engagement strategy for physics classrooms. Teachers will leave with ready-to-use materials and insights on implementing this activity to promote inquiry-based learning. My students have found this approach just as engaging as the original liquid vials activity, and I am excited to share its impact with fellow educators.