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The man who d*ed on Goliath, question - in the pictures it appears he is moving forward with the train, moving the same direction. The train is on a downhill, and I can envision the "weightlessness" feeling at the top of the hill, but I don't understand how he is moving forward with the train. Wouldn't he roll off the back and the train keep moving forward? Maybe the train is decelerating on the downhill, but if this is the case I don't understand how he "bounced" off the train multiple times. Someone please help, and RIP to the poor man and condolences to his family.

I think relativity of simultaneity is one of the parts of SR that confuses people the most. it confused me for a long time too.

Lightning hits both ends of a moving train. From the lighthouse, the rear one hits first. From the train, both hit at the exact same time. And both are right. it’s not about light taking time to reach them, even after you account for that they still disagree.

I tried to show it with the horizontal line in the spacetime diagram. everything on one horizontal line is “now” for that observer. From the lighthouse, the rear strike sits lower, so it’s earlier. Switch to the train’s frame and both strikes slide onto the same line. Same two events, different “now”.

I took this animation from a physics app I made. Curious if anyone has their own trick or way of thinking about it that made it click. would love to hear it!

How does a differential work? Why do metronomes synchronize? How can plasma be confined, and what happens to light near a black hole?

Explore interactive experiments from Makarov Physics Suite, Makarov Math Suite and Makarov Astronomy Suite in one journey through mechanisms, electricity, geometry, algorithms and space.

This video shows the software in action: robots and engines, particles and fluids, mathematical surfaces, spacecraft, planets and stars. In the programs, you can change parameters and explore how the results respond.

They named it that way

Disclaimer: I am not used to write in English (I’m a native French speaker) so please pardon me for my poor writing skills. Moreover, it’s my first Reddit post so I don’t really know how to start it correctly.

Context: Hello everyone, I have studied undergraduate physics in Belgium (University of Mons) during three years but I’m currently an undergraduate student in Mathematics as I want to deeply understand mathematical physics.
I want to continue my learning process in physics during this year but I am not able to follow the graduate courses in physics due to scheduling conflicts with my mandatory lessons in mathematics.
My question: I am looking for the best book(s) to learn GR with a more « mathematician friendly approach » (less intuition, more rigour). If you have different books to propose do not hesitate to give me tips. Ideally, I’d like a book that doesn’t assume prior knowledge of General Relativity and is suitable for self-study.

Thank in advance for your help !

i dont understand this can someone explain it to me like i am 12 plspls thanks

If General Relativity it says matrer tells spacetime how to curve and spacetime tells matter how to move, how is matter moving? What is the engine driving matter to move?

Been studying for my electromagnetism exam for about 2 weeks now, slightly understand the concepts. Finally checked out my study guide and I have 0 clue how to build into the answers of my problems. Like how do I know what formulas to use out of everything? When do I integrate/use a derived form? How do I even know what the derived form is? This doesn’t even make sense conceptually, where do I begin? Etc. I’m great at calculus and any other stem course. But for physics everything conceptual/math related I just get lost. What do I do?

Hello,

I am a total beginner (not a physics student, but I might become one) and want to study physics because I am very interested.

I want to know what books I should read to get the basic idea so I can then further my research.

Thank you 🌷