Students are pre-assigned to groups of 4-6 persons. Individually, students find or take an image or a video that captures the interaction of two objects in 3 separate periods of interaction: before, during and after. Students then draw a free-body diagram (FBD) of the two objects in the ‘during’ period of interaction, along with a written explanation of the interaction. Students upload their diagrams and explanations into an online collaborative platform (OCP).
As a group, students assess and peer-review each submission. Students then re-assess their FBDs and make changes accordingly.
The instructor presents the class with conceptual questions relating to momentum. Groups then discuss and answer the questions at a whiteboard or interactive board, providing a written rationale for their response. They then compare their answers to the conceptual questions to their previous analysis of interacting objects, identifying similarities between the two.
This activity then has two possible out of class follow up activities: Preparing a test question, or correcting their original FBDs with another step of peer review and instructor feedback.
Students will learn to determine whether or not a system is isolated, and the consequences for conservation of momentum. They will learn to explicitly attend to a system’s “before” and “after” states when analyzing it momentum, and to recognize elastic and inelastic interactions.
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