1. This integrated laboratory activity is designed to ask upper-division undergraduate students to measure the change in potential energy in an elastic system (PDM) between two different states.
  2. Students use the Partial Derivative Machine (PDM) to verify experimentally that the forces and dimensions of their system are state variables as well as measure the relationships between these quantities to compute the potential energy of their system.
  3. The whole class discussion focuses on the meaning of integration of discrete experimental data.

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