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PHY.3:3 - Forces
| Force | Tension |
|---|
| Reach across mechanisms | A bound can guide many designs, but its description must cover every design to which the conclusion is applied. |
| Complete physical change | Preparation, surroundings and restoration can determine the result; describing every microscopic detail would make the first inquiry unusable. |
| Admissible comparison | A simple reference can expose a strong limit, while a mathematically convenient inverse may require a physical operation that is unavailable. |
| Useful idealization | A larger class of ideal operations can yield a bound on real devices; an omitted physical contribution can invalidate that inference. |
| Continued construction | An obstruction can redirect work immediately, while removing that obstruction leaves further realization questions. |