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A Relatively Relevant Relativity Guide
jamonwindeyer:
--- Quote from: arunasva on May 26, 2017, 08:41:26 pm ---Hello, do we have to know all the thought experiments ? Like mass dilation ?
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Hey! The syllabus dictates that you know the thought experiments involving trains and mirrors - Those are the ones for time dilation. So those are the only ones you need, but the others are worth knowing to help you understand the concepts ;D
pikachu975:
--- Quote from: jamonwindeyer on January 28, 2017, 11:56:32 am ---Hey hey! So thats a good answer but, but you caught yourself, it never implied Einstein's version. Unless the word 'special relativity' is used, you have to go for the more general idea; the idea that all motion is measured relative to something else :) you've also probably included a little too much detail for a describe question (for an exam situation in any case). I would have probably answered like this:
The idea of relativity encapsulates the idea that all motion must be measured relative to something else. That is, the velocity of an inertial frame of reference cannot be determined without reference to another inertial frame (and you cannot determine the velocity of a non-inertial frame of reference at all).
In an exam, that's about 4 lines - Definitely enough for a 2 mark Describe question ;D hope this helps!!
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If it was like 4 marks DEFINITELY include GALILEO because he's the dude that found out about relativity not Einstein. Galileo's thought experiment with dropping something off the top of a ship and having an external observer sees that it drops straight for the guy on the ship but parabolic for an external observer, displaying relativity.
Galileo had 2 postulates!
1) You cannot determine if you are moving or at rest on an inertial frame with any mechanical experiment.
2) The laws of physics are true in all inertial frames.
I can't remember the second one but I think that's it.
jamonwindeyer:
--- Quote from: pikachu975 on May 27, 2017, 11:01:59 am ---If it was like 4 marks DEFINITELY include GALILEO because he's the dude that found out about relativity not Einstein. Galileo's thought experiment with dropping something off the top of a ship and having an external observer sees that it drops straight for the guy on the ship but parabolic for an external observer, displaying relativity.
Galileo had 2 postulates!
1) You cannot determine if you are moving or at rest on an inertial frame with any mechanical experiment.
2) The laws of physics are true in all inertial frames.
I can't remember the second one but I think that's it.
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Great call - I totally agree, if they bumped to 4 marks on "explaining" it then Galileo would be a must (perhaps a mention of him wouldn't have gone astray in my 2 mark answer too) ;D
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