falling stomach


by daveed
Tags: falling, stomach
daveed
daveed is offline
#1
Jul22-05, 09:24 PM
P: 142
how come when we fall near the earth, our stomachs lurch, but astronauts in their free-fall state out in orbit feel fine?
Phys.Org News Partner Physics news on Phys.org
Better thermal-imaging lens from waste sulfur
Scientists observe quantum superconductor-metal transition and superconducting glass
New technique detects microscopic diabetes-related eye damage
Janus
Janus is offline
#2
Jul22-05, 11:14 PM
Emeritus
Sci Advisor
PF Gold
Janus's Avatar
P: 2,352
I'd say that it has to do more with acclimation than anything else. On Earth we generally don't fall long enough to get used to the sensation. In orbit the body just adjusts to the new "norm" and eventually just ignores it.
pervect
pervect is offline
#3
Jul23-05, 01:30 AM
Emeritus
Sci Advisor
P: 7,434
Quote Quote by daveed
how come when we fall near the earth, our stomachs lurch, but astronauts in their free-fall state out in orbit feel fine?
Some astronauts do get space-sickness. Last I heard, in spite of a fair amount of research, nobody has been able to predict which ones will get space-sick and which one's won't. One might think that the short duration free-fall flights in the "vomit comet" would help screen out astronauts that were prone to space-sickness, but apparently this doesn't actually work.

This is frome a usenet posting from a usually reliable source:

http://yarchive.net/space/science/spacesickness.html

Danger
Danger is offline
#4
Jul23-05, 10:50 AM
PF Gold
Danger's Avatar
P: 8,961

falling stomach


Quote Quote by pervect
nobody has been able to predict which ones will get space-sick and which one's won't. One might think that the short duration free-fall flights in the "vomit comet" would help screen out astronauts that were prone to space-sickness, but apparently this doesn't actually work.
This might involve visual stimulae as well as physical situations. I, for instance, am absolutely terrified of heights but will do anything in an aeroplane. There are no reference lines to the ground, so it doesn't feel like being 'high'. Low-g in a plane feels perfectly natural (barely noticeable), but it bugs the hell out of me in an elevator or in those instances when my car leaves the ground briefly. I would expect that to be worse in a space-station environment, where every movement makes your body act like a gyroscope and things that should be on the ground are floating around your head.
timberfella
timberfella is offline
#5
Jul27-05, 05:28 PM
P: 3
Quote Quote by daveed
how come when we fall near the earth, our stomachs lurch, but astronauts in their free-fall state out in orbit feel fine?
I know the feeling you're talking about, and still get it if the car goes over a hump backed bridge, but I've been skydiving for 30 years, and have never suffered the same sensation, although 10,000 - 13,000 ft is still "near the earth" compared with astronauts.
subodei
subodei is offline
#6
Jul28-05, 01:32 AM
P: 20
If you're skydiving you should spend most of the time at terminal velocity and not accelerating, so you wouldn't get it as badly as an astronaut at least. Interesting that you've never felt it all though.
Danger
Danger is offline
#7
Jul28-05, 02:47 AM
PF Gold
Danger's Avatar
P: 8,961
Quote Quote by timberfella
I've been skydiving for 30 years
I will never understand why anyone would voluntarily climb out of a perfectly good aeroplane.

And you started doing that just about the same time that I started driving them.
russ_watters
russ_watters is online now
#8
Jul28-05, 02:17 PM
Mentor
P: 21,999
Quote Quote by Danger
I will never understand why anyone would voluntarily climb out of a perfectly good aeroplane.
There is only one way to gain that understanding...
Danger
Danger is offline
#9
Jul28-05, 02:20 PM
PF Gold
Danger's Avatar
P: 8,961
Quote Quote by russ_watters
There is only one way to gain that understanding...
That would involve telepathy, which I don't believe in, because sure as hell I'm never gonna do it myself.
Mk
Mk is offline
#10
Jul28-05, 07:00 PM
P: 2,057
Those who believe in psycokinesis... raise my hand.
russ_watters
russ_watters is online now
#11
Jul28-05, 09:30 PM
Mentor
P: 21,999
Quote Quote by Danger
So where do you get that name?
Danger
Danger is offline
#12
Jul28-05, 09:56 PM
PF Gold
Danger's Avatar
P: 8,961
Quote Quote by russ_watters
So where do you get that name?
You don't wanna know. Let's just say that it's earned.


Register to reply

Related Discussions
Vinegar and stomach acid pH Biology 26
How does the stomach know to vomit? Biology 26
If you have a weak stomach don't click here General Discussion 20
Falling Introductory Physics Homework 6