12 réponses à ce sujet

[TeffexPope]

OK I've played the Mass Effect series probably way too much but just now realized something. In ME2, when you walk out of the dock and past where Bailey is, theres, I guess, a parking garage for those 'cars' that everyone uses slightly below you. There's a few feet of a wall from the platform you are on, and there is a writing that  you can see:

Warning
Centrifugal pseudogravity in use on the Citadel
Dropped objects and persons jumping will fall towards the windows

There's even a facebook page for it if you can believe it.

Now I guess we see it in use in the first Mass Effect at the end of the game. But in Mass Effect 2, I just realized, you do fighting on it, in the Garrus loyalty mission. So I assume the gravity is used in the entire citadel. So why is it that when you're fighting in the loyalty mission, heatsinks and the falling LOKI mechs don't fly sideways towards the walls?

Modifié par TeffexPope, 11 février 2011 - 09:38 .

[Tennessee88]

Could simply be the orientation of the room. Or could be the same reason Gardner only moves when creepy genetically altered kidnappers grab him... things cost money and time.

[Bogsnot1]

This thing called relativity.

[azerSheppard]

TeffexPope wrote...

OK I've played the Mass Effect series probably way too much but just now realized something. In ME2, when you walk out of the dock and past where Bailey is, theres, I guess, a parking garage for those 'cars' that everyone uses slightly below you. There's a few feet of a wall from the platform you are on, and there is a writing that  you can see:

Warning
Centrifugal pseudogravity in use on the Citadel
Dropped objects and persons jumping will fall towards the windows

There's even a facebook page for it if you can believe it.

Now I guess we see it in use in the first Mass Effect at the end of the game. But in Mass Effect 2, I just realized, you do fighting on it, in the Garrus loyalty mission. So I assume the gravity is used in the entire citadel. So why is it that when you're fighting in the loyalty mission, heatsinks and the falling LOKI mechs don't fly sideways towards the walls?

SImple answer, they didn't program it.

We already knew the gravity on the citidel was due to the centrufugal force, it stated this in the codecs. We could argue why the gravity turned off at the end of ME1, did Saren or Sovereign mess with the motion?

[AkiKishi]

More than likely just caused by damage.

[Monochrome Wench]

Actually I'd suggest much more likely because you are too close to the axis of rotation where there is very little centrufugal force. There was likely still some force, but not very much. The Citadel Tower probably has its gravity normally modified by eezo because the force would be too weak at the top otherwise

[SmokePants]

I'm no physicist, but isn't the sign wrong? It's not just the citadel that's spinning. Every object on the citadel is also spinning and sharing the same angular momentum. When you jump, that momentum is not immediately lost -- you would continue to move in the direction of the spin and thus would not slam into a wall.

Now, if you were hovering, you would slowly lose momentum and eventually drift in the opposite direction of the spin.

The citadel tower obviously can't use this method of artificial gravity, because it is the central axis of the station and would experience far greater forces than the outer arms. It's also oriented orthogonal to the spin and gravity would push people against the walls, rather than the floor. The only way the tower could function as it does is if it does not spin with the rest of the station and employs regular, old-fashionedd, magic artificial gravity. The Presidium would also have to spin at its own, slower rate, compared to the arms.

EDIT: I may have it backwards. The force at the center is probably much less. In that case, the Presidium would spin faster than the arms and the tower would not (or should not) spin at all.

Modifié par SmokePants, 11 février 2011 - 01:16 .

[Confused_Shepard]

SmokePants wrote...

I'm no physicist, but isn't the sign wrong? It's not just the citadel that's spinning. Every object on the citadel is also spinning and sharing the same angular momentum. When you jump, that momentum is not immediately lost -- you would continue to move in the direction of the spin and thus would not slam into a wall.

Now, if you were hovering, you would slowly lose momentum and eventually drift in the opposite direction of the spin.

The citadel tower obviously can't use this method of artificial gravity, because it is the central axis of the station and would experience far greater forces than the outer arms. It's also oriented orthogonal to the spin and gravity would push people against the walls, rather than the floor. The only way the tower could function as it does is if it does not spin with the rest of the station and employs regular, old-fashionedd, magic artificial gravity. The Presidium would also have to spin at its own, slower rate, compared to the arms.

Oh Mr. Hawking you're so modest. 
But seriously, wonderful analysis and very true. 

[Scimal]

TeffexPope wrote...

OK I've played the Mass Effect series probably way too much but just now realized something. In ME2, when you walk out of the dock and past where Bailey is, theres, I guess, a parking garage for those 'cars' that everyone uses slightly below you. There's a few feet of a wall from the platform you are on, and there is a writing that  you can see:

Warning
Centrifugal pseudogravity in use on the Citadel
Dropped objects and persons jumping will fall towards the windows

There's even a facebook page for it if you can believe it.

Now I guess we see it in use in the first Mass Effect at the end of the game. But in Mass Effect 2, I just realized, you do fighting on it, in the Garrus loyalty mission. So I assume the gravity is used in the entire citadel. So why is it that when you're fighting in the loyalty mission, heatsinks and the falling LOKI mechs don't fly sideways towards the walls?

Easy.

There's no such thing as Centrifugal Force.

It's all Centripetal Force, and what you feel as "centrifugal" is you trying to fly off tangent to it.

Also, what was said above.

[transcendent12]

SmokePants wrote...

I'm no physicist, but isn't the sign wrong? It's not just the citadel that's spinning. Every object on the citadel is also spinning and sharing the same angular momentum. When you jump, that momentum is not immediately lost -- you would continue to move in the direction of the spin and thus would not slam into a wall.

Now, if you were hovering, you would slowly lose momentum and eventually drift in the opposite direction of the spin.

The citadel tower obviously can't use this method of artificial gravity, because it is the central axis of the station and would experience far greater forces than the outer arms. It's also oriented orthogonal to the spin and gravity would push people against the walls, rather than the floor. The only way the tower could function as it does is if it does not spin with the rest of the station and employs regular, old-fashionedd, magic artificial gravity. The Presidium would also have to spin at its own, slower rate, compared to the arms.

EDIT: I may have it backwards. The force at the center is probably much less. In that case, the Presidium would spin faster than the arms and the tower would not (or should not) spin at all.

The presidium ring is known to have a different gravity to the citadel arms  so that's been accounted for.

[Lapis Lazuli]

pseudogravity is one mean mother, huh?

[greyman33]

Looking at the orientation of the citadel arms, they appear to be oriented so the 'floors' face out from the main axis of the station. That is to say, when you look up/out from windows of buildings you see the other arms above you, relative to your position. If the arms are using the Presidium as a rotational hub, then the rotational force would be down relative to the orientation of the buildings, much like being planet-bound. Problems could be encountered at the transitional points between the Presidium and the Wards, but otherwise the station seems to have been built to maintain a sense of up and down that most terrestrial beings could relate to.

I suppose if the docking stations and airlocks for incoming ships were oriented differently from the Wards themselves, even slightly, then signage to that effect would be useful.

[markwiese]

SmokePants wrote...

I'm no physicist, but isn't the sign wrong? It's not just the citadel that's spinning. Every object on the citadel is also spinning and sharing the same angular momentum. When you jump, that momentum is not immediately lost -- you would continue to move in the direction of the spin and thus would not slam into a wall.

Now, if you were hovering, you would slowly lose momentum and eventually drift in the opposite direction of the spin.

The citadel tower obviously can't use this method of artificial gravity, because it is the central axis of the station and would experience far greater forces than the outer arms. It's also oriented orthogonal to the spin and gravity would push people against the walls, rather than the floor. The only way the tower could function as it does is if it does not spin with the rest of the station and employs regular, old-fashionedd, magic artificial gravity. The Presidium would also have to spin at its own, slower rate, compared to the arms.

EDIT: I may have it backwards. The force at the center is probably much less. In that case, the Presidium would spin faster than the arms and the tower would not (or should not) spin at all.

You are mostly correct, the sign IS wrong. The artificial gravity would appear to an observer to behave exactly like real gravity. There is no reason why objects not in contact with the ground would move towards the windows! In fact they would fall directly onto the ground the same as would happen with real gravity.

You did make a mistake though when you said "if you were hovering, you would slowly lose momentum and eventually drift in the opposite direction of the spin". You are forgetting Newton's First Law, which is ironic considering the man just outside of the entrance to the Citadel was talking about it. You, the object, are being held in your hover position by an external force, which means you would continue to hover relative to the same fixed point on the floor unless acted upon by another external force, so you could chill there forever without worrying about drifting!