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PHY.2:3 - Forces
| Choice | What it changes |
|---|
| Familiar mechanism or relevant behavior | An accessible mechanism helps reasoning only to the extent that its consequences address the target question. |
| Separate components or coupled operation | A connection can impose a constraint, transfer energy, change loading or introduce another state. |
| Manipulable source or faithful target consequence | Making the source easier to prepare and observe can alter a relation needed for the intended inference. |
| Known target law or proposed target mechanism | The former can support a derived transfer; the latter can yield a hypothesis and a discriminating next move. |
| One construction or complementary constructions | Different sources can expose different consequences, while disagreement can locate an unresolved premise. |