Minute Physics – Relativity






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8 Amazing Science EXPERIMENTS to do at Home * Interesting Electromagnetic Tricks

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Electric fields podcast

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Electromagnetism quiz

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10 ways to see the electric field

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Professor Dave explains Special Relativity

Special Relativity Part 1: From Galileo to Einstein

Special Relativity Part 2: Time Dilation and the Twin Paradox

Special Relativity Part 3: Length Contraction

Special Relativity Part 4: Mass-Energy Equivalence or E = mc²

General Relativity: The Curvature of Spacetime

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Physics Girl – Special Relativity and the Twin Paradox

How can just two rules of Einstein’s 1905 theory of special relativity lead to seemingly paradoxical changes in the perception of time?

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Veritasium – Can You Go the Speed of Light?

Einstein’s classic thought experiment involves sitting on a train travelling at the speed of light. If you hold a mirror in front of your face, will you see your reflection in a mirror? How could light from your face reach the mirror if the mirror is travelling away from you? But it would be a pretty spooky train if you couldn’t see your reflection so Einstein felt this solution wasn’t realistic. On the other hand if you could see your reflection, it would mean light was travelling at the speed of light inside the train. But that meant the same light observed from outside the train would be going twice the speed of light. This again seems inconsistent. So Einstein resolved that you must see your reflection but that light must travel at the same speed inside and outside the train. The only way this is possible is if space and time are perceived differently by observers inside and outside the train.

 

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Vsauce – Would Headlights Work at Light Speed?

If you were driving at the speed of light and turned on your headlights, what would happen?

 

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Exam formula sheet

Here is a copy of the exam formula sheet with rearrangements of equations.
It’s a very long list; it would be useful to make sure that you have the rearrangements (particularly kinematics and gravity) on your own summary sheet.

Formula sheet

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