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Gravity ?

tribblish

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POSTS: 126

Report this Aug. 08 2003, 2:51 pm

How does a starship (for example, the Enterprise-D) create an artificial gravity on board?

My dad, a physics teacher, says you could spin the ship, but unless it’s spinning REALLY fast, I don’t think they could get very far navigation-wise.

Maybe I’m wrong, but I thought that gravity centers at the center of mass. Wouldn’t that mean the center of gravity on the Ent-D be somewhere in either the saucer section or the engines? And if that was it, wouldn’t it keep changing because of the 1,000 some people moving all around the ship?

Then I started to think, well maybe it is, & we just see people walking up "normal" because we’re in the same place, basically.
What I mean is, assuming you could walk over water & all that, following the curve of Earth, if you walked from your home to the opposite point on Earth, the people would still be walking "normal" ("normal" defined as straight up & down, right side up). But if you didn’t follow the curve, they would appear upside-down to you. Here, let me see if I can explain this in a diagram:

< * * * <-- both right side up

* <-- he went straight down
( \/ )
* * <-- one one way; the other, the other

"Ya folla’?"
Well the turbolifts don’t appear to take any curves (see episodes & movies dealing with turbo lift shafts), and unless in a situation where the turbo lifts don’t work properly, it only takes ONE turbo lift trip to get to the deck destination.
If the Ent-D’s gravity were centered, & the turbo lifts don’t curve, you would need a few turbo lift trips to get to some locations.

Plus, when they show the windows of a ship, if someone is in there, they all are standing up-right. Hmmmm . . .

So back to my original question: How do they make the artificial gravity while making everything appear as it does?

Please don’t give me the cheap "it’s television for crying out loud!" excuse. ("Ya don’t think I’ve thought of that?")

Bonja

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POSTS: 876

Report this Aug. 09 2003, 8:01 am

The ships in Star Trek use "Gravity Plating" which generates artifical gravity as long as the ships have power.

tribblish

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POSTS: 126

Report this Aug. 09 2003, 12:32 pm

Then what happens when the ship doesn’t have power?

Bonja

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Report this Aug. 09 2003, 11:27 pm

Anything that isn’t fastened down floats aroun the ship.

Stephen480

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Report this Aug. 10 2003, 5:39 pm

he os roght all ships r equipped with gravity plating which give the ships gravity on all deck evern if the ship is spinning in evasive manuvers it don’t matter they stay on the deck it is hooked into lifesupport so thats y u don’t generally see them floatin around if u recall when in work force the doc as only one onboard life support was off and kimm and the commander came in suits with grav boots

doctortobe

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POSTS: 296

Report this Aug. 11 2003, 3:00 am

Also recall ST VI. You probably couldn’t have a ship that used spinning to produce gravity and still be able to pull the manuvers that starships do. Sure you could easily go in a straight line, but what happens when you need to turn really quickly?

Grav plating is probably just as important as the inertial dampeners in keeping starship crews from being ground into pate. Sure the dampeners would help stop the ship from moving but what keeps you from moving? That ensign that gets blown halfway across the room would keep on flying without grav plating.

How does it work? Who knows? I don’t think we know enough about gravity to guess. I think it’s kind of like asking a man to explain nuclear fission right after he discovered the atom. Then again, I could be wrong.

38957

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POSTS: 2103

Report this Aug. 11 2003, 9:53 am

Gravity is one of the four forces of the universe. Your Dad can confirm this.

We currently are quite good at producing artificial electro-magnetic force fields (with coils and capacitors), so Star Trek assumes that one day we will figure out how to artificially produce gravity force fields.

doctortobe

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POSTS: 296

Report this Aug. 13 2003, 1:34 am

We know what gravity DOES, you just need to jump up to figure that out. But the understanding of what makes up gravity and how you can produce it without having something either ultra massive or spinning is beyond our knowledge and capabilities. That was my point. You verified my point in your last post. With our current understanding of gravity, the grav plating either has to be dense enough to attract the crew to it, in which case they may as well use it as armor because anything that dense would be nigh invulnerable, or something has to be causing enough inertia to draw the crew to it. Since the Enterprise isn’t an interstellar tiltowhirl, I think we can safely count that out.

There’s no need to be smart in your answers. It doesn’t work on me and looks bad on you. I’m assuming by your answer that you indeed know enough about gravity to explain how it grav plating works. I’d really like to know.

Q1

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Report this Aug. 13 2003, 3:54 am

"How does a starship (for example, the Enterprise-D) create an artificial gravity on board?

My dad, a physics teacher, says you could spin the ship, but unless it’s spinning REALLY fast, I don’t think they could get very far navigation-wise."

You could simulate gravity with centrifugal force, the spinning of the ship, but I don’t see how you could align the ship and the people on it with that.

You could build the ship with super-massive materials that match the gravitational force of the Earth. That would create real gravity inside the ship but there are problems with that, like how it would attract things to itself in space because of its gravity, for instance something as massive as the moon. heh heh

Going back to science fiction for a second, you could have something like a tractor beam that simulates gravity on the ship.

Q1

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POSTS: 4335

Report this Aug. 13 2003, 4:53 am

The spin of the Earth doesn’t have anything to do with gravity. I remember they used to tell us in school that if the Earth stopped spinning everything on it would fly off because the spin of the Earth was what kept everything in place on the surface of the Earth. Of course though that doesn’t have anything to do with it. Gravity is a inherent property of matter, so it doesn’t matter, :) heh heh, if the Earth is spinning or not for gravity to exist. Gravity is a mutual attraction of matter for matter inherent in matter. They were obviously mistaking "centrifugal force" (by the way, centrifugal force is not a atual natural force. it’s just motion in a circular path.) for gravity.

I think they used centrifugal force on the movie 2001 but I’m not sure, I think they put a treadmill going in the opposite direction of a larger treadmill. I’m not absolutely sure how that would work though.

38957

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POSTS: 2103

Report this Aug. 13 2003, 9:30 am

I don’t know how Star Trek gravity plating works. No one does, it is fiction.

The spinning stuff is not really gravity but centrifigal force.

Just using plating density could not work unless they can figure out how to make material out of pure nuetrons and then the engines couldn’t move the ship, it would be to massive.

I think in Star Trek they use some sort of generator to create a gravity field, just like an electro-magnet creates a magnetic field.

The Earth doesn’t hold you down because it spins, the Earth holds you down because it is massive and the intensity of a gravity field is correlated to the mass of the two objects.

What is so smart about that? I was just discussing the topic. Lighten up.

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