Einstein, Relativity & Spacetime!

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Equivalence (2)‣ Einstein used this to formulate theequivalence principle that would be thefoundation of General Relativity.‣ It states that ``there is no experiment aperson could conduct in a small volume ofspace that would distinguish between agravitational field and an equivalentuniform acceleration''.‣ A consequence of this is that if anelevator is falling freely toward the groundbecause of gravity, an occupant inside willfeel weightless just as if the elevator wasfar away from any planet, moon, or star.No experiment would help you distinguishbetween being weightless far out in spaceand being in free-fall in a gravitationalfield.Oh no!I’m introuble!18
Gravity and Acceleration19 According to Einstein, gravity iseither an acceleration or a distortionin space and time. When accelerating, you feel aninertial force. When on the surface of a planet,you feel gravitational forces.
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: If a ball is dropped in the elevato
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 46 and 47: What have we learned?41• What is
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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