1. This small group activity is designed to give students practice in determining if work is being done on or by a system and further practice on identifying what is part of a system and what is part of its surroundings.
  2. Students use their knowledge of thermodynamics to determine if work is being done or by a system in each given physical situation and identify which parts of each scenario are parts of a system and which parts are its surroundings.
  3. The whole class discussion focuses on ensuring that students have good reasons for their answers and correcting students with wrong answers.

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