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What Hath Befallen Gravity?. Topic 4. Newton’s rules for the study of natural philosophy. Simplicity Generality Experimental verification Theories are tentative. Three Approaches to Forces. Action at a distance -no mechanism Field Description -space changed by body
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What Hath Befallen Gravity? Topic 4
Newton’s rules for the study of natural philosophy • Simplicity • Generality • Experimental verification • Theories are tentative
Three Approaches to Forces • Action at a distance -no mechanism • Field Description -space changed by body • Particle Exchange -emitted or removed
Principle of Equivalence • Downward pull of gravity can be duplicated by an upward acceleration