Jon,
This is a good question, and the answer can be found in this section of the manual.
For each point in a path or in a surface, Mechanical chooses precisely one body from which to calculate the results. If multiple bodies are scoped, Mechanical calculates the results from the body with the highest identifier (typically the latest one in the geometry tree). No averaging is done of a path result across bodies.
Regards,
Sandeep
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