1. I will not reference Half-Life gravity weapon or the Doom version as those do not interest me.

I know we can create artificial gravity, even proposing the creation of Nautilus-X. (Giant pinwheel like space station that creates some gravity by spinning.)

I guess my idea would be akin to tractor beams except reduced down into a bullet sized proportion. Basically the bullet creates a uni directional gravitational pull in front of itself , essential using the force of gravity to increase its velocity. Also if one would be able to do that, could you also in the same device create not zero gravity but at lessen the effects of gravity causing less friction? Which would lead to a projectile that constantly increases in speed as it moves.

I would assume on contact the 'bullet' would cease function stopping any 'going on for infinity' type issues.

PS: I posted this here because I am looking for as much hard science on this idea as I can get.

2.

3. Originally Posted by Wyverian
I know we can create artificial gravity, even proposing the creation of Nautilus-X. (Giant pinwheel like space station that creates some gravity by spinning.)
That's a simulated gravity, not "artificial gravity".
The difference is subtle but telling.

I guess my idea would be akin to tractor beams except reduced down into a bullet sized proportion.
Good. Now develop a tractor beam.
(Where would the power source be in a bullet-sized object?)
And, again, a tractor beam isn't "artificial gravity" any more than me pulling a sledge via a rope is artificial gravity.

essential using the force of gravity to increase its velocity.
Really?
What sort of "g force" are you expecting to generate?
Given that a bullet travels at (depending on what it's fired from) anything from 300 m/ sec to 2,000 m/ sec how much extra velocity is going to be added during travel?
What effect do you think this will have?

Also if one would be able to do that, could you also in the same device create not zero gravity but at lessen the effects of gravity causing less friction?
Friction isn't dependent on, or even related to, gravity. Or mass.

Which would lead to a projectile that constantly increases in speed as it moves.
To what purpose?

PS: I posted this here because I am looking for as much hard science on this idea as I can get.
Be prepared for disappointment...

5. The only gravity weapon systems I have ever heard about was a few odd plans to drop things from up in orbit on places in the world that you don't like.
I thought the idea was totally crazy, but then it hit me...

6. If this fits more in the sci fi department that is fine move it there. I posted it here because I write hard sci fi so I am trying to flesh the technology out better. As such I am working from a stance of not knowing much about science and trying to create technology that is at least some what logical and plausible. As only one of you really posted anything relevant outside of spam and snide remarks I will respond to Dywyddyr.

I thought friction was caused by particles of something acting against the particles of something else? So by weakening the effects of gravity would create less interference by opposing particles.

As for a power source I understand that this would have to be a large bullet to have one in it. I was thinking a fission power supply unless something else could potential generate more energy.

To What Purpose and effect? Creating a weapon that increases speed and by extension force. This would provide more stopping power as the bullet would transfer more energy into the target.

7. Originally Posted by Wyverian
I thought friction was caused by particles of something acting against the particles of something else? So by weakening the effects of gravity would create less interference by opposing particles.
Only by "reducing gravity" so that surfaces are less in contact 1.
Friction itself is a function of surface roughness, to put it simply.
In general engineering when calculating friction neither mass nor area are considered.

As for a power source I understand that this would have to be a large bullet to have one in it. I was thinking a fission power supply unless something else could potential generate more energy.
In which case: a f*cking large bullet.
You need
A) a fissionable mass
B) shielding (unless you expect your troops to die of radiation poisoning - possibly before they get to pull the trigger)
C) a "conversion process" to turn the energy thus created into usable power by
D) the tractor beam generator
E) the focussing element.
F) whatever else I've forgotten to list.

To What Purpose and effect? Creating a weapon that increases speed and by extension force. This would provide more stopping power as the bullet would transfer more energy into the target.
That's what I meant by "to what purpose?".
A bullet as currently made/ use is sufficient to kill.
A gun round (say anti-tank) as currently made/ used is capable of penetrating a tank.
Should improved killing power be required then we up the calibre and/ or the velocity by simpler means (e.g. rail gun/ ETC).
There are simpler and cheaper methods of doing it than yours.
(And, like I said, how much extra velocity do you expect to get?)
Stopping power 2?

1 Which is also slightly iffy in that friction is largely "area independent".
2 Apart from the fact "stopping power" is
A) much disputed - with regard to existence, and
B) as much a function of bullet shape/ type/ calibre as velocity 3
it's also only "relevant" for human/ living targets: which militates - strongly - against a bullet (i.e. a projectile fired from a human-portable weapon).
3) IIRC (I can't be bothered to look through my hard drive for the actual equations) "stopping power" relies on momentum, and not energy: i.e. it varies linearly with velocity. Which means that to gain a significant increase in "stopping power" via velocity you need that increase in the velocity itself. Far, far far, simpler to optimise the projectile itself - pre-fragemented/ mushrooming/ frangible...

8. Okay I misunderstood your original to what purpose. That answer however is heavily sci fi involving a superior technological and physical alien race that can shrug off even rail/coil/gauss fire. In other words it was needed to be able to harm these aliens. (As i stated this can be moved into sci fi, though the concept of alien life beyond us is possible at least to my knowledge.)

I am not sure, how much velocity, I was thinking with the gravity pulling the object toward the target and by lowering the restence of the surface area would cause it to increase exponentially.

9. Originally Posted by Wyverian
I am not sure, how much velocity, I was thinking with the gravity pulling the object toward the target
Then you're going to have to set up a spreadsheet and do some (at least ballpark) calculations to see how viable (if at all) any velocity increase is.

and by lowering the restence of the surface area would cause it to increase exponentially.
That's NOT going to be a function of any "gravity generator". Seriously.
Drag increases as the square of speed, so the faster the round goes the more drag it will create, and that isn't going to be offset, or even mitigated, by the "reduced gravity".

You'd be far better off with improved materials for the projectile methinks (denser and/ or "smarter 1") than any believebale velocity increase from the "gravity generator" - especially given the problems with fitting one into a round from a man-carried weapon.

1 By "smarter" I mean optimised for the target: dense penetrating core/ mushrooming round to dump the energy into the target/ whatever, not "smart" as in self-targeting/ target-seeking.

10. Alright dropping back and punting sense obviously my initial idea is not going to work in an plausible manner. Let me turn this question around real quick and ask how would you weaponize gravity?

11. Originally Posted by Wyverian
Alright dropping back and punting sense obviously my initial idea is not going to work in an plausible manner. Let me turn this question around real quick and ask how would you weaponize gravity?
Drop heavy things on places or people I didn't like?

If you want an idea of how powerful that can be take another look at the Tungaska Event or the recent meteorite that exploded over Russia on Feb 15, 2013.

Tunguska event - Wikipedia, the free encyclopedia

Chelyabinsk meteor - Wikipedia, the free encyclopedia

a

http://en.wikipedia.org/wiki/Kinetic_bombardment

12. What you could do to weaponize gravity is fly in a large bomber or Cargo plane over a region where children are starving and without clean water, electricity and medical facilities, and throw out heavy hydroponic infrastructure components, water filtration units, solar panels and heavy medical equipment. This way you could both murder people using the force of mass and gravity and also use psychological warfare by showing your could be helping but lack the basic ethical and moral capacity to do so, which would add confusion and dismay on your victims on top of the sorrow caused by killing brothers, fathers, mothers, sons and daughters.

Or send a rocket over to an asteroid thats not too big with a rocket payload and push the asteroid towards your target. If space faring aliens were to want to attack earth, its one of the options, they just stay hidden in the asteroid belt and destroy cities and regions of the earth with asteroids, while theres little we could do about it, and when threres no more human civilization then they come and clear out the remnants (which is a more plausible plot than the silly movies like Independence Day).

13. Originally Posted by icewendigo

If space faring aliens were to want to attack earth, its one of the options, they just stay hidden in the asteroid belt and destroy cities and regions of the earth with asteroids, while theres little we could do about it, and when threres no more human civilization then they come and clear out the remnants (which is a more plausible plot than the silly movies like Independence Day).
This is basically the approach the aliens in Footfall took. They just dropped rocks on us from high orbit. Not from the asteroid belt, since these were surgical strikes; designed to force us into surrender without completely destroying our infrastructure, which they preferred to keep for their own use. (There was also a psychological effect in play here. They were herd animals, and just beat their enemies into submission, after which they were absorbed into the herd. The idea of going back on a surrender was alien to their psyche.) They did however divert a large asteroid into an Earth collision path as a last resort threat.

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