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Thread: effects of gravity

  1. #1 effects of gravity 
    SEEKER Genesis's Avatar
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    does the moons gravitational pull have a weakining effect on Earths own gravitational force. just wondering if so can it be measured#


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    Genius Duck Moderator Dywyddyr's Avatar
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    Yes - but "weakening" isn't really the word.
    And yes.
    https://www.thenakedscientists.com/a...ectly-overhead
    or
    Do You Weigh Less When the Moon is Above You? – The Solstice Blog


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  4. #3  
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    Quote Originally Posted by Dywyddyr View Post
    You also weigh more when the moon is below you. Interestingly, the more you weigh when it's below you is not equal to the less you weigh when it's above you. That's because when it's above you are closer to it so its pull on you is stronger than when you are farther away, when its below.
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  5. #4  
    KJW
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    Quote Originally Posted by doitright View Post
    You also weigh more when the moon is below you. Interestingly, the more you weigh when it's below you is not equal to the less you weigh when it's above you. That's because when it's above you are closer to it so its pull on you is stronger than when you are farther away, when its below.
    This is incorrect because it ignores that the centre of gravity of the earth is in freefall with respect to the moon's gravity. That is why there is a high tide both towards the moon and away from the moon. That is, the change in weight caused by the moon is due to the tidal force of the moon, not the gravity itself.
    There are no paradoxes in relativity, just people's misunderstandings of it.
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    Quote Originally Posted by KJW View Post
    This is incorrect because it ignores that the centre of gravity of the earth is in freefall with respect to the moon's gravity. That is why there is a high tide both towards the moon and away from the moon. That is, the change in weight caused by the moon is due to the tidal force of the moon, not the gravity itself.
    Is the tidal "force" properly described as the difference between the acceleration1 of the earth's center and various other points on the earth’s surface?

    1. From the earth’s frame of reference relative to the moon.
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