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Thread: Can gravity be affected by surroudings.

  1. #1 Can gravity be affected by surroudings. 
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    There are 2 same objects, the distance between them is 1m, the mass of object is 1 kg.

    We know the gravity between them is 6.67x10^-11N. (The law of universal gravitation)

    Image you stand between these 2 objects, can gravity between them stay unchanged?

    Jin Guangnian


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    the objects are round balls and the radius are relatively small.


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  4. #3  
    Brassica oleracea Strange's Avatar
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    By "gravity" you mean force, I assume.

    If you stand between the balls then they will feel the force of the other ball plus the force due your mass. It will not affect the force due to the other ball.

    You are, presumably, using to calculate the force between them. The total force is just the sum of the force due to all masses. There is no term in the equation which indicates that the force due to one mass is affected by any other.
    ei incumbit probatio qui dicit, non qui negat
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    Quote Originally Posted by Strange View Post
    By "gravity" you mean force, I assume.

    If you stand between the balls then they will feel the force of the other ball plus the force due your mass. It will not affect the force due to the other ball.

    You are, presumably, using to calculate the force between them. The total force is just the sum of the force due to all masses. There is no term in the equation which indicates that the force due to one mass is affected by any other.
    But I still think the gravity between 2 objects can be affected by other objects.

    As I know, Mr Newton didn't tell us the mechanism of Gravity. Can he really give us a valid equation to calculate gravity.

    If you assume a=b+c, after mathematical calculation, you can still get the conclusion that a=b+c. But it doesn’t mean a=b+c is correct, it’s just an assumption.
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    Brassica oleracea Strange's Avatar
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    Quote Originally Posted by tomjin2000 View Post
    But I still think the gravity between 2 objects can be affected by other objects.

    As I know, Mr Newton didn't tell us the mechanism of Gravity. Can he really give us a valid equation to calculate gravity.
    Well, it wasn't an "assumption", it was based on observation and has been confirmed by all observations since. Do you have a reason or evidence for suggesting that "the gravity between 2 objects can be affected by other objects"?

    Of course, there are people who have looked at extensions to the model. Einstein, obviously, quite successfully. But also:
    • Milgrom, less successfully, with MOND.
    • Bekenstein's tensor–vector–scalar gravity.
    • Buchdahl's f(R) gravity.
    • Moffat's nonsymmetric gravitation.
    • Moffat's scalar–tensor–vector gravity
    • Sanders' bi-scalar tensor vector gravity

    And several others. None of them are without problems.
    Last edited by Strange; March 21st, 2012 at 06:44 AM.
    ei incumbit probatio qui dicit, non qui negat
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    Moderator Moderator Markus Hanke's Avatar
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    Quote Originally Posted by tomjin2000 View Post
    There are 2 same objects, the distance between them is 1m, the mass of object is 1 kg.

    We know the gravity between them is 6.67x10^-11N. (The law of universal gravitation)

    Image you stand between these 2 objects, can gravity between them stay unchanged?

    Jin Guangnian
    Are you referring to gravitational shielding ? If so, there is currently no evidence that such an effect exists :

    Gravitational shielding - Wikipedia, the free encyclopedia
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    Quote Originally Posted by Strange View Post
    Quote Originally Posted by tomjin2000 View Post
    But I still think the gravity between 2 objects can be affected by other objects.

    As I know, Mr Newton didn't tell us the mechanism of Gravity. Can he really give us a valid equation to calculate gravity.
    Well, it wasn't an "assumption", it was based on observation and has been confirmed by all observations since. Do you have a reason or evidence for suggesting that "the gravity between 2 objects can be affected by other objects"?

    Of course, there are people who have looked at extensions to the model. Einstein, obviously, quite successfully. But also:
    Milgrom, less successfully, with MOND.
    Bekenstein's tensor–vector–scalar gravity.
    Buchdahl's f(R) gravity.
    Moffat's nonsymmetric gravitation.
    Moffat's scalar–tensor–vector gravity
    Sanders' bi-scalar tensor vector gravity
    And several others. None of them are without problems.
    We all know the Aether electromagnetic theory in 19th century, scientists loved this theory so much at that time.

    In 17th, the Aether gravitational was also very popular, this theroy was dominant in science for almost 100 years. It was defeated by the law of universal gravitation in the middle of 18th century. This theory was founded by René Descartes, and developed by Christiaan Huygens and Gottfried Wilhelm Leibniz. The 17th aether theory has long gone, and most people even never hear about it.

    I love 17th Aether theroy so much, I believe it's correct. This Aether theory tells us a very different story about gravity, it tells us the gravity between 2 objects can be affected by other objects.
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    Quote Originally Posted by Markus Hanke View Post
    Quote Originally Posted by tomjin2000 View Post
    There are 2 same objects, the distance between them is 1m, the mass of object is 1 kg.

    We know the gravity between them is 6.67x10^-11N. (The law of universal gravitation)

    Image you stand between these 2 objects, can gravity between them stay unchanged?

    Jin Guangnian


    Are you referring to gravitational shielding ? If so, there is currently no evidence that such an effect exists :

    Gravitational shielding - Wikipedia, the free encyclopedia
    Gravitational shielding is a very interesting topic.
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  10. #9  
    Brassica oleracea Strange's Avatar
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    Quote Originally Posted by tomjin2000 View Post
    I love 17th Aether theroy so much, I believe it's correct. This Aether theory tells us a very different story about gravity, it tells us the gravity between 2 objects can be affected by other objects.
    Why is it relevant whether you "love" the theory or not?

    What does the evidence tell us?
    ei incumbit probatio qui dicit, non qui negat
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  11. #10  
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    Quote Originally Posted by tomjin2000 View Post
    Gravitational shielding is a very interesting topic.
    I don't doubt that, but unfortunately it doesn't exist.
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  12. #11  
    Moderator Moderator Markus Hanke's Avatar
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    Quote Originally Posted by tomjin2000 View Post
    I love 17th Aether theroy so much, I believe it's correct. This Aether theory tells us a very different story about gravity, it tells us the gravity between 2 objects can be affected by other objects.
    It is not correct, as has been experimentally proven long ago :

    Hammar experiment - Wikipedia, the free encyclopedia

    There is no such thing as aether.
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  13. #12  
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    Quote Originally Posted by tomjin2000 View Post
    Quote Originally Posted by Strange View Post
    Quote Originally Posted by tomjin2000 View Post
    But I still think the gravity between 2 objects can be affected by other objects.

    As I know, Mr Newton didn't tell us the mechanism of Gravity. Can he really give us a valid equation to calculate gravity.
    Well, it wasn't an "assumption", it was based on observation and has been confirmed by all observations since. Do you have a reason or evidence for suggesting that "the gravity between 2 objects can be affected by other objects"?

    Of course, there are people who have looked at extensions to the model. Einstein, obviously, quite successfully. But also:
    Milgrom, less successfully, with MOND.
    Bekenstein's tensor–vector–scalar gravity.
    Buchdahl's f(R) gravity.
    Moffat's nonsymmetric gravitation.
    Moffat's scalar–tensor–vector gravity
    Sanders' bi-scalar tensor vector gravity
    And several others. None of them are without problems.
    We all know the Aether electromagnetic theory in 19th century, scientists loved this theory so much at that time.

    In 17th, the Aether gravitational was also very popular, this theroy was dominant in science for almost 100 years. It was defeated by the law of universal gravitation in the middle of 18th century. This theory was founded by René Descartes, and developed by Christiaan Huygens and Gottfried Wilhelm Leibniz. The 17th aether theory has long gone, and most people even never hear about it.

    I love 17th Aether theroy so much, I believe it's correct. This Aether theory tells us a very different story about gravity, it tells us the gravity between 2 objects can be affected by other objects.
    Yes it's important to hang on to discredited ideas from 4 centuries ago just because you love them...let's see, that's when the earth was believed to be flat. How did that work out?
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