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It is not the case that The law of free fall cannot be refuted by experiment alone because it functions as a definition of 'free fall'.
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Reasons For
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Reason for 1 of 2
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1.
Quine's holism shows that no statement functions as a pure definition immune to revision; all statements face the tribunal of experience collectively.
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2.
If 'free fall' is redefined whenever anomalies arise, this constitutes an ad hoc maneuver that Lakatos would identify as degenerative within a research program.
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3.
The empirical success of Newtonian mechanics in predicting trajectories demonstrates that free-fall laws carry genuine predictive content beyond mere stipulation.
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Reason for 2 of 2
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1.
Poincaré's own conventionalism acknowledged that conventions are chosen for empirical convenience, making systematic predictive failure a legitimate ground for revision.
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2.
If the law of free fall were purely definitional, it could not explain why bodies deviate from predicted paths near massive rotating objects, yet general relativity does explain this.
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Reasons Against
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1.
The law of free fall defines what 'free fall' means rather than making an empirical claim subject to test.
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2.
Definitions are not empirically falsifiable.
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