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/sci/ - Science & Math

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4973523 No.4973523 [Reply] [Original]

People say you can experience the feeling of zero-g in the nasa falling plane simulator.

But isn't that false? if you are in free fall your body accelerates and can't we feel acceleration? So is the NASA thing not the actual feeling of zero g but quite the opposite, the feeling of exactly one g?

>> No.4973534

A G is acceleration, the plane and you are indeed accelerating towards the earth (cause its falling remember?), But you don't see the earth, you only see the inside of a plane that is moving and accelerating exactly as fast as you, so relative to the plane there is no acceleration and thus: zero-g

>> No.4973536

>>4973534
The air is moving with you too, so your body doesn't feel a thing.

>> No.4973539

>>4973534

you're wrong, but good try

>> No.4973535

>>4973534
But acceleration isn't relative.

>> No.4973548

>>4973536
Your body should feel acceleration

>> No.4973553

>>4973535
>But acceleration isn't relative.
yes it is.

>> No.4973557

>>4973553
Then why do you feel pushed into your seat when you accelerate in your car?

>> No.4973559

You can't internally distinguish the force of gravity from acceleration. Standing on Earth you're feeling one g of "upward acceleration" right now. It's exactly the same as if you were on an "upward" accelerating platform in deep space. When you're in freefall the "upward acceleration" is canceled out by actual downward acceleration.

>> No.4973561

>>4973559
And without the air underneath you whooshing by, you simply float in silence.
However, I'm a former astronaut and floating in the ISS is a lot more interesting.

>> No.4973574
File: 17 KB, 830x637, acceleration.png [View same] [iqdb] [saucenao] [google]
4973574

>>4973559
no it's not.

I feel no acceleration, I feel force. that's why i feel weighed down.

I can easily distinguish the force of gravity form acceleration, they are two different things.

There is no "upward acceleration" you mean force?

>> No.4973578

>>4973574
>I can easily distinguish the force of gravity form acceleration
that's physically imposable to do, not even the most advanced technology can do that, you are talking bullshit.

>> No.4973580

>>4973561
pics or it didn't happen

>> No.4973587

>>4973578
That's right my bad.

But why is freefall where you haev 1g of force on you considered the same as space where you have 0 g's of force on you.

>> No.4973588
File: 17 KB, 367x388, 1344180791785.jpg [View same] [iqdb] [saucenao] [google]
4973588

>>4973574
No you can't distinguish them you underage retard.

>> No.4973595

>>4973588
Ya you're cool, you really fit in with all the old fags. No one will notice your insecurity.

Ya I know I was wrong.. Still doesn't answer my question.

>> No.4973596
File: 63 KB, 727x477, time_for_4chan_.jpg [View same] [iqdb] [saucenao] [google]
4973596

>>4973580

>> No.4973598

>>4973574
Right, force. You're in a windowless box. If it's accelerating one way, you feel a force in the other direction. If the box is resting on a planet, you feel a force in the direction of the planet. You shouldn't be able to tell the difference.

>> No.4973600

>>4973598
Ya but I'm not talking about being on the ground or falling I'm talking falling vs being in space.

>> No.4973603

>>4973587

Reference frames, bro. As the accelerating body, you are in an non-inertial reference frame and perceive zero forces on yourself, and making it feel like you are floating in space. Compare this to an inertial reference frame (constant velocity/ no acceleration), like when you are standing on the ground, and newton's laws suddenly apply again.

>> No.4973601

>>4973557
In the car situation, you remain stationary relative to the thing which is providing the acceleration, thus you experience a force. The same thing happens when you stand on earth. If you're in freefall you're moving closer and closer to the earth. The force of gravity is accelerating you rather than pushing you against something.

>> No.4973604

>>4973600
>>4973574
You don't feel acceleration when you stand on the ground because you're not accelerating. You feel the force of the earth pushing against the force of gravity that is pulling you down. In free fall these forces are not there, and you feel weightless. Weight, mind you, is only the result of a normal force.

>> No.4973605

>>4973603
If you put an acceleometer in space and in the plane wouldn't it give different readings.

>> No.4973606

>>4973598

No.

Just no.

If the box is at rest, it is in equilibrium. Forces balance out.

>> No.4973609

>>4973605

If you put it in space within earth's gravitational field, then you are correct. If you put it in space far away for any gravitational field, it will not accelerate and thus register no acceleration.

>> No.4973614

>>4973609
Ok what I mean is this.

You have a closed system (closed box) and you drop it from a plane with an accelerometer.
Then you take the same box with the same accelerometer and leave it in space. It will show two readings.

That means it can tell whether its in space or in the "NASA 0-G thing". Humans have a built in accelerometer. so we should be able to tell if we are in space or not.

>> No.4973615

>>4973609
It won't register any acceleration in free fall either.

>> No.4973634

>>4973615

I stand corrected. My apologies. I looked a little deeper into accelerometers.

>> No.4973714

>>4973634
So did you also figure out or accept the answer to the original question?

>> No.4973893

>>4973614
Gravity works on every part of you at once, evenly, and thus it's very hard to tell unrestricted acceleration from gravity from floating in micro gravity.

Normally our acceleration from gravity is checked by pressure from the ground/floor/chair/lap of Santa Claus and is very easy to detect. Without such an object below you though, it's impossible to tell from micro gravity.

>> No.4973897

The aircraft dives at an acceleration of 9.8 meters a second per second. This counters the ubiquitous force field dragging everything in the aircraft down at 9.8 meters per second per second and gives the temporary illusion of weightlessness.

>> No.4973900

>>4973561
if you were a former astronaught, you would know that you were really a former cosmonaught

>> No.4973922

you are accelerating at the same rate as your surrounding, and your whole body is also accelerating at the same rate, hence you dont feel any reaction forces, which is the feeling of weightlessness.

also note that no matter where you are in the outer space, there is still gravity, its the fact that you are accelerating at the same rate as everything around you that gives the feeling of weightlessness

>> No.4973937

First of all, accept the fact that the Vomit Comets do indeed provide an extremely good approximation of weighlessness.
Why? Well both the plane and the occupants are accelerating at the same rate towards the Earth. Therefore the relative acceleration between the occupants and the plane is zero. Zero acceleration = zero force.
And as someone already pointed out the equivalence of acceleration and gravity, zero force = zero gravity.

(well ok, it's not exactly zero. but go fuck yourself)

>> No.4973938

>>4973937

And second of all - go fuck yourselves summerfags.
I sure hope none of the morons in this thread got accepted to do any university to study any scientific discipline.

>> No.4973953

>>4973523
Perhaps i have a large closed box.
Inside the box there is no air, no forces (ie. sense of gravity).
However inside this box is an observer floating directly in the middle of the box.
Now lets say i decide to move the box manually from the outside.
Would the observer move in relation to the box he is confined to, would he feel the effects of inertia?