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PHY.9:3 - Forces
| Force | Tension |
|---|
| Coupling and selectivity | A strong response can amplify an unwanted influence as well as the target. |
| Preparation and observation | The same interaction can be informative for one prepared state and uninformative for another. |
| Reference and portability | A comparison can remove an unknown contribution while depending on shared physical conditions. |
| Signal and disturbance | The probe can make a difference visible while changing the quantity whose earlier value was wanted. |
| Local sensitivity and usable range | A steep response can improve a local estimate while leaving distant possibilities indistinguishable. |
| Improved measurement and effort | Another interaction is useful only when its added distinction matters enough to the receiving work. |