Gravitational Mass

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Shoofle
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Gravitational Mass

Postby Shoofle » Sat Apr 15, 2006 2:59 pm UTC

How would it work that an object would have a high inertial mass but low gravitational? I can't imagine it. Or the other way around. But it can be imagined? Interesting. How does that work?

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davean
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Postby davean » Sat Apr 15, 2006 4:18 pm UTC

Well, I guess that our feeling for that illusion could come from something like drag.

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Postby Shoofle » Sat Apr 15, 2006 6:18 pm UTC

In that case the resistance to movement is not the inertial resistance of the dragee but the resistance of, for example, the air particles being pushed ahead of it, and the resistance to compression of those air particles. There's no drag in space! Everything works better in space!!

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Postby xkcd » Sun Apr 16, 2006 12:31 pm UTC

I don't see what the problem is -- just imagine something that acts like it has no gravity (easy -- we don't notice the gravity FROM most things) and doesn't react to gravity (weightless). So a chair that just floats around the room, but still takes force to push on. Like how things are in space.

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Postby Matt » Mon Apr 17, 2006 5:40 pm UTC

What's the background here; is there something reported to have these properties in a situation where most things don't float around?
Hi. I'm from Massachusetts.

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Postby davean » Mon Apr 17, 2006 6:32 pm UTC

Matt wrote:What's the background here; is there something reported to have these properties in a situation where most things don't float around?


Not your mama, she fat.
Last edited by davean on Tue Apr 18, 2006 4:02 am UTC, edited 1 time in total.

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Matt
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Postby Matt » Tue Apr 18, 2006 3:37 am UTC

davean wrote:Not you mama, she fat.


Your mama is so fat she broke her leg and hot bloody fat came out. Some of it even got on the mayor!
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Postby Ikarus » Tue Jan 16, 2007 12:29 am UTC

I guess it should read "her attraction goes up as the cube of the inverse distance", because that's how the gravitational potential looks like in our world.

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Postby Hawknc » Tue Jan 16, 2007 12:37 am UTC

Wow, blast from the past.

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Postby i » Tue Jan 16, 2007 2:06 am UTC

hmmm.... this seems to be an old thread...

*scrubbing bubbles*. I'm gonna respond anyway.

You could look at the issue from a mathematical point of view. Take the equation for the force of gravity and the equation for accelleration. Then increase or decrease the gravitational coefficient.

This change will effect the equation for gravity without effecting the equation for accelleration.


ps. I suppose if you ever found a way to derive one equation from the other, you would become a very famous person.

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Re: Gravitational Mass

Postby 40010Mike » Fri Oct 10, 2008 3:07 pm UTC

Well, this is definitely a dead thread.

But, as an Asimov-addict, I wanted to steer those who enjoyed reading this comic (as much as I did) towards some slick sci-fi that took on a similar issue.

Take the ponderance made by the hat and change it to read "One could imagine an extremely large object with [zero] resistance to force and no gravity...but this is never observed."

The short story is titled "Super-Neutron" and can be found in the short story collection The Early Asimov, or Eleven Years of Trying.

Happy Reading!

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Re: Gravitational Mass

Postby 22/7 » Fri Oct 10, 2008 3:12 pm UTC

Hawknc wrote:Wow, blast from the past.
Totally not a hypothetical...

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Re: Gravitational Mass

Postby tendays » Fri Oct 10, 2008 9:39 pm UTC

There's nothing wrong in necroing an underexploited but potentially cool thread, is there?

You get a similar effect if you look at an object in a medium with high density (but low viscosity, so doesn't create too much friction).
It will both get less attracted by other objects, and will attract other objects less (Archimedes). However its resistance to motion will stay the same. If the density of that object is lower than the mediums, you get an object seems to have a negative gravitational mass but positive inertial mass (think bubbles).

Now let the people who actually know something about physics yell at the nonsense I just spouted (IOW, IANAP)
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