do vacuums have gravity?

[seattle]

i cant make heads or tails of this:

a ball falls freely in a vacuum experiences gravitational acceleration. what is its numeric value in m/s/s ? in c/s/s?
help!!!!!!!!!!1

[senocular]

Polar bear!

[seattle]

sigh
please help....a link...anything

[kirupa]

Well think about it, what exactly is m/s/s - what is the more common term it is known by. Also, for the second part, think about how you would convert something from "m" to "cm". In other words, what number would you multiply by :sure:

EDIT: Phil, I thought a vacuum is any area where the effects of air resistance or anything that might hinder an object in free fall is removed.

[seattle]

u sure dude cause i cant screw this up

[seattle]

heres the whole question

a ball that falls freely in a vacuum experiences unifrom acceleration called the acceleration of gravity. what is its numeric value in m/s/s ? cm/s/s?

[thoriphes]

Is the vacuum a Hoover? Cause I heard those things suck, and if this object's falling, then it's really not a good vacuum is it? ;)

9.8 m/s/s
980 cm/s/s

[seattle]

do vacuums have gravity?

[thoriphes]

a ball that falls freely in a vacuum experiences unifrom acceleration called the acceleration of gravity. what is its numeric value in m/s/s ? cm/s/s? oh, i dunno. :sure:

what would happen if there were no gravity? like space? would you fall into the black darkness of space?

[seattle]

for the record kirupa says no, and no cracks on hoovers please:)

[eyeinfinitude]

um.....uh....ok....sure....

[thoriphes]

I believe I have the urge to merge.

[kirupa]

Phil, read the last few words of this link: http://216.239.41.104/search?q=cache:FzzLaViNIywJ:www.glenbrook.k12.il.u s/gbssci/phys/mmedia/newtlaws/efar.html+vacuum,+air+resistance&hl=en&start=9&ie=UTF-8
A vacuum will always have gravity on earth ;) A vacuum will not have the pesky effects of air resistance or bugs that may slow a vacuum cleaner that falls out of the sky.

[senocular]

vaccuums have no effect on gravity, only wind resistence. Gravity is a property of mass. The greater the mass, the greater the gravitational pull that body of mass possesses.

Newton’s Law defines the force of gravity between two objects with

F= G * (Mass1 * Mass2)/distanceBetween^2

where G is the gravitational constant (some value I cant remember)

[seattle]

nm i got in case any1 cares its 9.8m/s/s

[thoriphes]

Ok, so you don't make any more threads here's a little lesson:

Most physics questions and examples will use a vacuum in the problem because in a vacuum, there is no air, thus no air friction. What those this mean? Gravity inside a vacuum is close to the exact value for gravity on Earth, which is 9.8 m/s/s (meters per second squared). If you drop a feather outside of a vacuum, it takes longer to fall because of air friction that is a force pushing up (for every action, there is a reaction). Now if you dropped a feather inside a vacuum tube, it falls as if it were a rock or something. Thus, anything in a vacuum succumbs to the full force of gravity.

[thoriphes]

Originally posted by seattlejaguar
nm i got in case any1 cares its 9.8m/s/s
Originally posted by thoriphes
Is the vacuum a Hoover? Cause I heard those things suck, and if this object's falling, then it's really not a good vacuum is it? ;)

9.8 m/s/s
980 cm/s/s Got a keen eye there? ;)

[[Legoman]]

I think in order phor it to be a vacuum, it must be devoid of everything; or else its not a vacuum. No protons, electrons, no minute matter, no outside interpherences such as gravity or acceleration due to gravity.

In the definitions you provided there was only one suggestion that there must be a lack of external influences, this is misleading and false however.
A vacuum, is simply an area devoid of matter.
I have conducted experiments at school and university on the effects of gravitational pull and electromagnetic fields on electrons passing through a vacuum so I think I'm in a good position to clear this matter up.

plus, it's pretty well known that space is a vacuum, If gravitational pull was not in effect in space we would not orbit the Sun.

[[Legoman]]

yo yo philman, always feel it's best to just dive back in head first.
ain't had much time of late having decided on a major change of direction, dropping out of Uni and saving up to go study sound engineering.
Splitting my time between long hours in a minimum wage job and seeing the missus. Not much left over for flash, kirupa or lego :(

Still popping in when I can though, it all seems to be ticking over nicely in here

[prstudio]

its the 9.8 and the 980

o and phil

vacuum contains no resistance, untainted environment for an object to act natural in it...

vacuum is here on earth, so it means that gravity is affecting the vacuum(prolly a tube setup), which means that gravity affects what is inside the tube...

being that there is nothing inside the tube to stand in the object's way, that means that the objects acceleration is as close to the gravity acting on it from the outside as possible.

boom, simple as it comes.

physics is phun!

:nerd:

[eilsoe]

I was taught it to be 9.82 m/s

:)

[thoriphes]

well technically, you can have it as 9.81 m/s/s

[prstudio]

yeah the engineering equiv is different

[pom]

Hey, let's open a physics forum!! :P

[kirupa]

I refuse to be a part of any forum where a word happens to contain the hideous, heinous, and downright hellish "ph" letter combination in them - ilyas. Fizix on the other hand sounds perfectly sofisticated :beam:

[prstudio]

gah,
again physics is phun!

it likes you kirupa, it wants you on its dodgeball team, it invites you to its birthday parties...

[BadMagick]

I was always lead to believe that a vacuum was totally free of matter, and that it's contents were free of gravity, such as outer space.

Who knows?! I never was that good at physics. Always been an english/rhetoric person...

[reverendflash]

if vacuums didn't have gravity, then how do you empty the bag?

Revhttp://aulman.com/rev.gif

[BadMagick]

Clever Rev! Clever ....

[dessoya]

a vacuum is just an "air-free" room... that has nothing to do with gravity - gravity is that thing, what holds you on the bottom - its more an electromagnetic field. out of space, there is no magnetic field, there is nothing what gravitades you, because you are outside the orbit...

you can simulate zero gravity.
a nice example: you are in a lift - that lift suddenly falls down with 8.2m per sec. you wont realize the gravity, because you are feeling agravic. so you have no clue if you are falling or not...

thats pretty cool...

newtons law: F = ( G *m1 * m2) / r²

m1 + m2 = mass of the objects
r = distance of the two objects
G = Gravity (6,67259*10 ^-11)*((N*m²)/kg²) thats a natural absolute term

then you can calculate like that

m1 = 67 kg
m2 = 52 kg
r = 1m

we are looking for: F in N (Newton)

Step:
F = (G* (m1*m2/ kg2)
G=(6,67259*10 ^-11)*((N*m²)/kg²)
F=(6,67259*10 ^-11)*((N*m²)/kg²)*((67kg*52kg)/1m)

F=2,3247 * 10^-6
N=0,0000023247N

you can calculate the fallingacceleration with this formula:

G = 2 * s / t²

G= Gravity
s= distance
t = time

good luck

~:azn:

[Marz]

Allright people... Most of you got really close to what a vacuum truly is while some strayed.. Some actually hit it right on the nose however...

First thing I'll say is gravity is not a "thing" neither is it "matter".. Seeing as how a vacuum is an area or space that is devoid of matter.. I'm pretty sure that we can have gravity...

But wait... What's the definition of gravity.. The force that is excerted between two objects...

Well.. An object is defined as a composition of molecules or what is known to be matter... So an object can not be found in a void or a vacuum...

Therefore... Absolutly nothing can exist in a true vacuum.... Because there are no objects to act upon the objects inside of the vacuum.

But... The vacuums we use here on earth are just airless.. Which mean they provide no air resistance or friction... They are not suppose to be called vacuums however, the correct term for them are "controlled environments".. In which case, the scientist has made an airless entity to test the true functionability of what life would be like in an airless environment...

Technically.. Two human beings can be gravitationally attracted to each other... But it is to such a tiny, minute force.. That we are not moved by it because our physical mass is greater than the maximum amount of force provided by the two objects...

A planet when compared to a human however, has enough force to pull someone in... That's why the moon has a lighter gravity.. because it is smaller..

The sun, being the epicenter, is the largest of all entity's in mass... And therefore provides the most gravitational pull out of all the planets around us.. Which is why the sun is at the center and the planets orbit around us..

Space is not a vacuum technically, but rather the closest form of a vacuum we have.. It is an airless environment... Which is why scientists study "controlled environments" here on Earth.. To feel what it is like in space....

Soryr if I went all nerd.. I'll shut up now.. :p

[dessoya]

there are NO true vacuums out there...
in a true vacuum there is no gravity, there is nothing... theres even no dark matter...

it sucks i think ;)

~:azn:

[reverendflash]

Originally posted by dessoya
there are NO true vacuums out there...
in a true vacuum there is no gravity, there is nothing... theres even no dark matter...

it sucks i think ;)

~:azn:

kinda like Los Angeles then?

::ducks behind hills::

:beam:

Revhttp://aulman.com/rev.gif

[reverendflash]

Originally posted by Phil Jayhan
No, theres lotsa dark matter in Los Angelos Rev, HELLO! :)

pj :P

sorry, just thought about the big sucking portion...

:/

Revhttp://aulman.com/rev.gif

[m_andrews808]

A vacuum is simply a region of space that contains no matter, but it can exist within a gravitational field. The fact that matter placed within the vacuum may experience a gravitational pull does not stop the vacuum being a vacuum. The only prerequisit of a vacuum is that it contains no matter!

Any mass exerts a gravitational field on other masses. This force decreases the further you are from the mass. The force tends to zero as you move away from it but never actually dies away to nothing. That is to say you can never completely escape the gravitational pull of the Earth and similarly the furthermost particle at the boundaries of our expanding universe is at this very moment in time pulling you towards it even if the force it exerts is immeasurably small.

Back to the original question, a vacuum doesn't have gravity because it doesn't have any mass, but this doesn't stop it exisiting within a field of gravity (as any vacuum in the universe will).

:P

[pom]

Originally posted by dessoya
out of space, there is no magnetic fieldYa sure? :sure:

I believe you're wrong, for the exact same reason as andrew just explained :)

[tiger20]

ask Google. He is all knowing all powerfull. He single handidly got me through college.

[prstudio]

we should discuss ion wind propulsion next.

[hsalf]

the acceleration due to gravity on earth no matter whether you are in a vacuum or not is about 9.81 m/s2 where 2 is for squared

[seattle]

LOL!! I MADE THIS POST SOO LONG AGO. WHAT R U DOING BACK HERE LOL

[Laslett]

Originally posted by hsalf
the acceleration due to gravity on earth no matter whether you are in a vacuum or not is about 9.81 m/s2 where 2 is for squared


There actually minor differences between sea level and the highest point on earth.

I wondered when I could use my degree