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Abstract Title: A Board Meeting Resolves A Sharp Disagreement About Friction in The System Schema
Abstract: After learning Newton's 2nd Law, students in a university modeling-based introductory physics class are asked to imagine a box sliding across a floor and slowing to a stop. Although they've had extensive experience with friction in the context of energy, this is their first exposure to friction within the context of force.  They are asked to make and coordinate different representations for this scenario, including a system schema, and force diagram.  During their small group work, students quickly run into a difficulty:  there are only two interactions with the box (contact, gravitational), so there should only be two forces, yet the box is slowing, which means it must have unbalanced forces in the direction of acceleration.  In this paper, I present evidence from a student-led whole-class discussion (a board meeting) showing how the class uses the System Schema to come to consensus after an initial sharp disagreement between small groups.
Abstract Type: Contributed Poster Presentation

Author/Organizer Information

Primary Contact: Brant Hinrichs
Drury University
729 N. Drury Lane
Physics Dept.
Springfield, MO 65802

Contributed Poster

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