Einstein, Relativity & Spacetime!

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What have we learned?41• What is the primary topic of the general theory ofrelativity?• The general theory of relativity is primarily a theory ofgravity, stating that the force of gravity arises fromdistortions of spacetime.• What is spacetime?• <strong>Spacetime</strong> is the four-dimensional combination of space andtime that forms the “fabric” of our universe.
What have we learned?42• What is the equivalence principle?• The effects of gravity are exactly equivalent to the effects ofacceleration.• What do we mean by dimensions?• Each dimension represents an independent direction of possiblemotion. In three-dimensional space, the three dimensions oflength, width, height are perpendicular to one another. A fourdimensionalspace has a fourth dimension perpendicular to allthree of the others. We cannot visualize this, but it can still exist.• Does spacetime differ for different observers?• No. Both time and space differ for observers in differentreference frames, but the combination of spacetime is the samefor everyone.
Page 1: Einstein & Spacetime!
Page 5 and 6: 3b• Time and space are relative t
Page 7 and 8: ‣ The speed of light is nature's
Page 9 and 10: Special Relativity (2) 5• Einstei
Page 11 and 12: Einstein deciding on which mathemat
Page 13 and 14: 9Einstein had put forward two postu
Page 15 and 16: In the picture below a rocket ship
Page 17 and 18: In the exampleshown here, thefast t
Page 19 and 20: General Relativity15A new descripti
Page 21 and 22: If a ball is dropped in the elevato
Page 23 and 24: Gravity and Acceleration19 Accordin
Page 25 and 26: Curvature in Spacetime20a
Page 27 and 28: Mass and Spacetime22• According t
Page 30 and 31: Other Effects of General Relativity
Page 32 and 33: Solar Eclipse Experiment27The bendi
Page 34 and 35: diagram:29
Page 36 and 37: Lensing Basics 31A Normal LensBendi
Page 38 and 39: Gravitational Lensing 33Double imag
Page 40 and 41: 35Lensing of a CastleAnd we place a
Page 42 and 43: 37The various types ofgravitational
Page 44 and 45: Wormholes and Time Machines39• Ei
Page 48 and 49: What have we learned? 43• How doe
Page 50 and 51: New Termsnatural motionviolent moti

Einstein, Relativity & Spacetime!

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