Date post: | 20-Dec-2015 |
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What Hath Befallen Gravity?
Topic 4
Newton’s rules for the study of natural philosophy
1. Simplicity
2. Generality
3. Experimental verification
4. Theories are tentative
Three Approaches to Forces
A. Action at a distance
-no mechanism
B. Field Description
-space changed by body
C. Particle Exchange
-emitted or removed
Flat Space vs. Spherical Space
Effect of Acceleration
Principle of Equivalence
• Downward pull of gravity can be duplicated by an upward acceleration
Curvature of Space
Deflection of Light
Orbital Precession
Gravitational Red Shift
Black Hole
Particle Exchange
Expanding Universe