General Relativity 1915

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General Relativity (1915)

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A theory of gravity
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Classical Physics
Newton Gravity is a force which
acts between two masses.
Unification of celestial with terrestrial

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F G m1 m2 / r2
Problem explains strength of force but not how
it works
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General Relativity
Einstein Gravity is a curvature of space-time
caused by the presence of mass.
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Planet orbiting Sun follows curved space-time
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F mia Wgt mg g
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Principle of Equivalence

• The effects of gravity are equivalent to the
  effects of acceleration.

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gravity
acceleration
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Light follows path of geodesic in space-time
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Experimental Evidence for General Relativity
(effects not predicted by
Classical Physics)
Path of light bends when passing near a large
mass.
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1919 measurements during solar eclipse showed
light from a star followed a curved path near
the Sun.
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apparent position
actual position
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Limitations of General Relativity
Does not work when explaining sub-atomic
interactions
Need quantum theory
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Einsteins Ultimate Quest
A unified theory of everything