1. This small group activity is designed to provide practice evaluating flux integrals and interpreting them geometrically, and also motivates the Divergence Theorem.
  2. Students work in small groups to determine the flux of water through a fishing net.
  3. The whole class wrap-up discussion emphasizes the use of geometric reasoning as one way to navigate through the many sign choices needed to evaluate the flux, as well as the geometry of the final answer and its relation to the Divergence Theorem.

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