Stresses, Forces, and Geodesics

1. Stresses
   1. Stress tensor.
   2. Stress tensor of GEM.
2. Forces:
   1. EM Lorentz force.
   2. EM to gravity analogy.
   3. Gravitational force.
   4. GEM force
3. Geodesics
   1. Effect of a geodesic.
   2. Cause of curvature in a geodesic.
   3. Killing's differential equation.