What is the difference between SR and GR?

in agreement with mathman, though possibly more simply put,

SR entails movement, and how different observers perceive time is dependent upon the relative velocity of those observers.

GR concerns Gravity, and the effects of mass on space and time.

to put it simply,
 
dumbest man on earth said:
very simply put ,
SR entails movement, and how different observers perceive time is dependent upon relative velocity of those observers.
GR concerns Gravity, and the effects of mass on space and time.
Click to expand...
Thank you for your reply and likewise to other posters .

Is what you mention about observers perceiving time , SR , the time dilation part of relativity ?

Thanks in advance
 
dumbest man on earth said:
Probably a good bit over-simplified, but yes.

An Internet Forum is not the best place to get educated, if you really want to learn about SR and GR, though.
Click to expand...

Thank you for your reply .

I'd of thought a science forum would be the perfect place to learn , yourselves have been answering my questions !

I do have some basic knowledge of physics but SR and GR is quite confusing , almost imperceivable .

When time slows down , is it possible to reverse time flipping the direction of time ?

Thanks in advance.
 
Mark Turner said:
Thank you for your reply .

I'd of thought a science forum would be the perfect place to learn , yourselves have been answering my questions !

I do have some basic knowledge of physics but SR and GR is quite confusing , almost imperceivable .

When time slows down , is it possible to reverse time flipping the direction of time ?
.
Click to expand...
The thing with science forums, like any public forum, they are open to any Tom, Dick or Harry. The trick is to sort the wheat from the chaff, or the experts and knowledgable from the nonsense. I'm only [probably like yourself, an amateur] and have learnt plenty from forums like this, supplemented with reputable reading of the likes of Sagan, Weinburg, Thorne, Rees.

I'm not sure I understand your "flipping time" question properly, but two important issues to remember are [1] All Frames of references, are equally valid and real, and [2] each frame always sees time pass at 1 second per second within his own frame.
 
Mark Turner said:
Is what you mention about observers perceiving time , SR , the time dilation part of relativity ?
Click to expand...
Yes...example: If you and I were approaching a BH, and me being far more intrepid then you, decided to have a look inside, while you observed at a safe distance......You would observe me approaching the EH, but gradually being continually red shifted until beyond the capabilities of your on board scopes and I would just fade from view from your perspective.We call that gravitational time dilation and gravitational redshift. From my position, I would continue on merrily and cross the EH and fall towards the center, eventually being torn asunder depending on the BH's size...a large SMBH, the tidal effects would not be felt right away...with a stellar size BH, I could invariably be torn asunder even before I crossed the EH. https://jila.colorado.edu/~ajsh/
 
paddoboy said:
Hmmm, can I tidy that up some?
The curvature/warping of spacetime is caused by matter/energy, and we see that effect as gravity. :wink:
Click to expand...
How about I tidy that up some as well? The curvature/warping of spacetime is caused by the effect that gravity has on matter.
 
paddoboy said:
The thing with science forums, like any public forum, they are open to any Tom, Dick or Harry. The trick is to sort the wheat from the chaff, or the experts and knowledgable from the nonsense. I'm only [probably like yourself, an amateur] and have learnt plenty from forums like this, supplemented with reputable reading of the likes of Sagan, Weinburg, Thorne, Rees.

I'm not sure I understand your "flipping time" question properly, but two important issues to remember are [1] All Frames of references, are equally valid and real, and [2] each frame always sees time pass at 1 second per second within his own frame.
Click to expand...
I am only an enthusiast , I'd rather have the answers given than try to give answers .

If in different frames of reference both measure 1 second per second , who is correct ?

Thanks in advance .
 
Mark Turner said:
I am only an enthusiast , I'd rather have the answers given than try to give answers .

If in different frames of reference both measure 1 second per second , who is correct ?

Thanks in advance .
Click to expand...
Both are equally correct in there own frame.
https://www.khanacademy.org/science...ocity-time/v/introduction-to-reference-frames
https://www.khanacademy.org/science...on/v/finding-an-in-between-frame-of-reference
https://www.khanacademy.org/science...ocity-time/v/introduction-to-reference-frames
 
paddoboy said:
Both are equally correct in there own frame.
https://www.khanacademy.org/science...ocity-time/v/introduction-to-reference-frames
https://www.khanacademy.org/science...on/v/finding-an-in-between-frame-of-reference
https://www.khanacademy.org/science...ocity-time/v/introduction-to-reference-frames
Click to expand...

Alright , thank you for your reply .

I'm starting to understand SR better now .

I understand from all of the given answers ;

Time can be measured at difference rates but each observer measures 1 second per second relative to their reference frame .

Is that correct ?

Thanks in advance .
 
You must log in or register to reply here.
Back
Top