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Newton equal but opposite action
Newton equal but opposite action
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Old 9th February 2018, 05:42 PM   #1
andy2 is offline andy2  United States
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Default 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.
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Old 9th February 2018, 06:08 PM   #2
Groove T is offline Groove T  Switzerland
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Sorry, what is your location?
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Old 9th February 2018, 06:49 PM   #3
rayma is online now rayma  United States
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Quote:
Originally Posted by andy2 View Post
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.
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Old 11th February 2018, 07:19 PM   #4
MagicBus is online now MagicBus  Greece
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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.
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Old 11th February 2018, 07:52 PM   #5
Cal Weldon is offline Cal Weldon  Canada
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Newton equal but opposite action
Frank, be nice.
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Old 13th February 2018, 03:43 PM   #6
andy2 is offline andy2  United States
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I supposed an action caused by a feather is not the same as a rock for example. Intuition sometimes does not payoff.
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Old 13th February 2018, 06:27 PM   #7
Groove T is offline Groove T  Switzerland
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