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Special Relativity For Dummies!

Special Relativity For Dummies!. Mr. Trotts. Classical Relativity. 1,000,000 ms -1. 1,000,000 ms -1. How fast is Spaceship A approaching Spaceship B? Both Spaceships see the other approaching at 2,000,000 ms -1 . This is Classical Relativity. Einstein’s Special Relativity. 0 ms -1.

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Special Relativity For Dummies!

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  1. Special Relativity For Dummies! Mr. Trotts

  2. Classical Relativity 1,000,000 ms-1 1,000,000 ms-1 • How fast is Spaceship A approaching Spaceship B? • Both Spaceships see the other approaching at 2,000,000 ms-1. • This is Classical Relativity.

  3. Einstein’s Special Relativity 0 ms-1 300,000,000 ms-1 1,000,000 ms-1 • Both spacemen measure the speed of the approaching ray of light. • How fast do they measure the speed of light to be?

  4. Special Relativity • Stationary man • 300,000,000 ms-1 • Man travelling at 1,000,000 ms-1 • 301,000,000 ms-1? • Wrong! • The Speed of Light is the same for all observers

  5. V Time Travel! • Time between ‘ticks’ = distance / speed of light • Light in the moving clock covers more distance… • …but the speed of light is constant… • …so the clock ticks slower! • Moving clocks run more slowly!

  6. Three effects • 3 strange effects of special relativity • Lorentz Transformations • Relativistic Doppler Effect • Headlight Effect

  7. Lorentz Transformations

  8. Lorentz Transformations • Light from the top of the bar has further to travel. • It therefore takes longer to reach the eye. • So, the bar appears bent. • Weird!

  9. Doppler Effect • The pitch of the siren: • Rises as the ambulance approaches • Falls once the ambulance has passed. • The same applies to light! • Approaching objects appear blue (Blue-shift) • Receding objects appear red (Red-shift)

  10. V Headlight effect • Beam becomes focused. • Same amount of light concentrated in a smaller area • Torch appears brighter!

  11. Warp • Program used to visualise the three effects Demo . . .

  12. Fun stuff • Website:http://www.adamauton.com/warp/ Stonehenge Eiffel Tower

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