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PHY.10:3 - Forces
| Force | Tension |
| Discrimination and estimation | Better knowledge of one account’s parameters can leave its difference from another account unresolved. |
| Larger contrast and changed regime | A stronger intervention can expose the wanted effect while adding another physical mechanism. |
| Control and feasibility | A mathematically useful input need not be physically preparable with the available actuator, subject and resources. |
| Shared conditions and informative change | A comparison needs enough continuity to interpret a difference, while the test deliberately changes something. |
| Specific prediction and uncertain premises | Different nominal predictions can overlap after consequential parameter and apparatus uncertainty is included. |
| Useful criticism and effort | A simple consequence can settle the working question while a more elaborate experiment promises broader knowledge at greater cost. |