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among all the time the planet
was spinning status will
you we'll treat called around before
the international space station
they've all got at least one thing in common
find out how they all come full circle
on will work
a moon orbit supplanting just like a planet orbit start
and accrued nearly circular path
affairs we'll curves one essential point as well
and of course when you go around the world with a yo-yo
it's circling around your hand
and why does all this happen because of a little thing calls and triple force
basically central force is a force that makes an object like planets for other
satellites in space
following current path
the word central means center seeking
what better place to study central force than on the largest artificial satellite
in space the international space station
in addition to actually experiencing some triple force the freefall
environment on board the ice s aloft for some really cool demonstrations select
sum it up to expedition twenty-two astronaut jeff williams
this is a tool
it's a special tool that we use on board the space station actually during space
walks miles but it's just it's a heavy metal object and that's what i really
wanted to use nancy i am it's tied to a string
her with a string onto this bungee right here
finished just floating here in weightlessness and you can see the
spirits dust string years is uh... rather loose
smith just kind of floating randomly
if i were to rotate this thing on the strength around this bungee let me do
this
you can see that the string
polls taught
and stays tight
and the toll continues to rotate around the bungee in fact if you look really
close at the bundy can see that the bungee bands
at the point that it's rotating
in advance toward the tool
and that is uh... caused by the centrifugal force
due to the angular acceleration of uh... of the tool as a rotates around
keepin this string tonight
and keep in the rotation in a circular motion
this is same kind of force that applies to the rotation of planets around the
sun or the moon
somewhere on the air
or the space station around the earth
you might notice that
nine of the moon nor the i says is attached approved by a string
and they still orbit
why is that
thing about this satellites would continue to move in a straight line
because of inertia
remember that emerges attendance even object to keep on doing what he was
doing before something forced it to change
gravity is the force causing that change
satellites in orbit around earth are being polled toward earth by earth's
gravity
acceleration occurs because gravity is continuously changing the satellite's
direction
for this and how this works take a look at this
out there you know you on a spinner on my finger
on this table
the string here is acting like the force of gravity if i let go when the yo-yo is
at this time point
where do you think the yo-yo sinners sha is going to take it
will continue in a circular motion
as you can see delia wants to keep moving in a straight line serve a
purpose
this really is the only thing that held the yo-yo and secular pack
the strength simulates gravity in the same way u_s_s_ is held in orbit by
earth's gravity
if for some strange reason earth's gravitational pull disappeared geysers
would continue whatever direction it was head here's jet with another
demonstration obstetrical sports
can get this debate and it's got that c_n_n_ of course and it's got air
bubbles upon running it
the bubbles dot
uh... rise to the top
in the essence of gravity in this weightless environment of space mission
but if i were to rotate this elicited by converted in keep it in your view
the camera
let's watch what happens
if you look really close
you'll see the air bubbles starting to coalesce in the center
poverty there
internal modem
there's a bubble spread throughout the t
the for rotated
the bubbles callers to the center of the t
and eventually form a circle
why they did it because of the center for the force spread throughout the t
that the the the liquidity goes to the outside of the bags ended forces the air
into the senate
because the areas has less mass
palestinian city
then uh... than liquid
severe goes to the senate
sensible forces affect things here on earth as well as in space
things like ferris wheels of the acceleration of a car going on on the
curb
what other applications might this force had in space
here are a lot of talk uh... perhaps and in regards to space exploration about
uh...
artificial gravity perhaps you've seen some science fiction movies
for example star trek uh... that tv show and the move
uh... they had gravity on board
add some kind of a mysterious artificial gravity
make believe of course
uh... but we've talked for years about artificial gravity
onboard a spacecraft especially uh... when you go on for a long period of time
for various reasons
one of the ways you could produce artificial gravity is by recover the
space station that rotates
may be very very in there
the bigger it is the slower the rotation will have to be
to produce that send ripples force
jeff said that the bigger the station
the slower would have to spend to treat the central force
needed to make that artificial gravity
to find out why we have to check out the math
center pital acceleration is equal to the velocity of the objects ordered
divided by the radius of the object
spend is velocity divided by race
the radius is a distance from the center of the circle twenty point on the circle
the spin in size of the radius
are actually inverse proportion
on a spinning station a larger the radius the small the rate of change
needs a seemingly gravity directly to do that they really believed it could take
a large station produced
through centrifugal force sort of an artificial gravity
to keep everything
in its place
uh... but the problem with that is when uh...
is celebrate practical because when you spend something
and we turn our head around
uh... are handover stabler system will get a little bit uh...
messed up in
uh... it's like if you're gonna run uh... other merry-go-round right in
maryland then you step off the plane
uh... or you spin around until you get dizzy
uh... it be the same kind of thing so
i'm not sure artificial gravity
in that way is very effective
wonder who will be the first to produce artificial gravity
but it's a very spin your wheels
use them at the helps solve this challenge
arson attack
unreal world