Newton equal but opposite action
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 9th February 2018, 05:42 PM #1 andy2   diyAudio Member   Join Date: Nov 2004 Location: StupidVille Newton equal but opposite action Does this still hold true now that we have Einstein general relativity? If an action is met with an equal but opposite direction, but since both are relative and not absolute, one action may not be equal the other if relativity is taken into account.
 9th February 2018, 06:08 PM #2 Groove T   diyAudio Member     Join Date: Apr 2008 Location: Rapperswil at Lake Zürich Sorry, what is your location?
rayma
diyAudio Member

Join Date: Apr 2011
Quote:
 Originally Posted by andy2 If an action is met with an equal but opposite direction, but since both are relative and not absolute, one action may not be equal the other if relativity is taken into account.
The total momentum is conserved in all reference frames.
That's because, in the center of mass frame, it's zero.

Last edited by rayma; 9th February 2018 at 07:19 PM.

 11th February 2018, 07:19 PM #4 MagicBus   diyAudio Member     Join Date: Aug 2016 Location: Athens, Greece When it's about high mass moving at low speed in a closed system, then relativity does exactly this, i.e. ensures that the actions won't be altered by external forces. I guess subatomic particles moving at high speed is another thing.
 11th February 2018, 07:52 PM #5 Cal Weldon   Speakerholic diyAudio Moderator     Join Date: Jan 2004 Location: Near Vancouver Frank, be nice. __________________ My wife said I was acting immaturely. I told her to get out of my fort and take her girl germs with her.
 13th February 2018, 03:43 PM #6 andy2   diyAudio Member   Join Date: Nov 2004 Location: StupidVille I supposed an action caused by a feather is not the same as a rock for example. Intuition sometimes does not payoff.
Groove T
diyAudio Member

Join Date: Apr 2008
Location: Rapperswil at Lake Zürich
Quote:
 Originally Posted by Cal Weldon Frank, be nice.
Always yours

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