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Microgravity - Contenido educativo

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Subido el 28 de mayo de 2007 por EducaMadrid

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NASA Connect Segment exploring the aspects of microgravity and how it affects objects in space. Explores object motion and friction and tests the PSA prototype in accordance with these forces.

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Hi, I'm here with Dan Andrews, and he's a research engineer on the PSA team. 00:00:00
Hey, Dan. 00:00:06
Hey, Jennifer. 00:00:07
Tell me a little bit about what you do here. 00:00:08
I'm a controls and automation engineer at the NASA Ames Research Center. 00:00:10
My team is working on evolving the PSA robot vehicle. 00:00:13
In designing the propulsion system for the PSA, 00:00:17
we had to keep in mind that things move differently on the International Space Station than they do here on Earth. 00:00:19
Jen, this would be a good time to see if students can describe two ways in which motion of something in the Space Station 00:00:24
is different than the way things move on Earth. 00:00:30
Dan, I think that's a great idea. 00:00:32
Teachers, now is the time to pause the program, 00:00:34
and students, write down two ways that you think items move differently in space than they do here on Earth. 00:00:36
If you mention something about microgravity, well, you're on the right track. 00:00:43
You may have seen microgravity on the International Space Station. 00:00:47
It appears that items are floating on the International Space Station, 00:00:51
but in fact, everything is moving or falling at the same rate. 00:00:55
To learn more about microgravity, check out the NASA Connect program, Who Added the Micro to Gravity? 00:01:00
So, did you mention something about friction or lack of friction? 00:01:06
Well, you're also on the right track. 00:01:09
The motion of an object on the Space Station is like moving on ice 00:01:11
or throwing a ball versus rolling it on the ground. 00:01:15
This is a functional prototype of the PSA, which means it's a working model. 00:01:19
We have also tested the prototype on a granite table, which has very little friction, like an air hockey table. 00:01:23
So, it's a simulation of what motion is like on the ISS. 00:01:28
So, Dan, how does the PSA move? 00:01:31
In this functional prototype of the PSA, we're using fans. 00:01:34
We have six sets of fans located around the robot. 00:01:37
Air is drawn in from one side of the fans and expelled out the other side. 00:01:40
That creates a force on the robot and enables the PSA robot to move. 00:01:44
It's important that we use a quiet propulsion system because it's relatively noisy on the Space Station 00:01:48
and we don't want to aggravate the problem. 00:01:53
We also need to test the PSA in three dimensions. 00:01:55
We need to allow it to move up and down, left and right, forward and backward. 00:01:59
Within this facility, we've created a smart crane, which lets the PSA move as if it's in space. 00:02:04
We use this crane to test how the PSA can do obstacle avoidance and just generally get around. 00:02:10
Dan, aren't there some laws or rules of motion that affect the way things move? 00:02:16
That's right. There are laws of motion that apply whether you're here on Earth or on the ISS. 00:02:21
Sir Isaac Newton figured out the laws of motion way back in the 1600s. 00:02:25
He said that an object at rest will remain at rest. 00:02:29
Sure, Dan, that makes sense. 00:02:32
If something is sitting on a table, for instance, it will stay there until someone moves it or some force moves it away. 00:02:34
Newton also said that once an object is in motion, it will keep moving unless you apply a force to it, 00:02:40
like giving it a push or a pull. 00:02:45
Now, wait a minute. That doesn't make sense to me. 00:02:47
Doesn't everything just stop moving eventually? 00:02:49
Things stop moving because of gravity and friction. 00:02:52
In microgravity, you can really see Newton's laws at work. 00:02:55
Let me see if I have this straight. 00:02:58
If something is moving, it may or may not have a force acting on it. 00:02:59
And to stop it, you have to apply a force? 00:03:04
That's right. On the ISS, the PSA will float because of microgravity, and it will keep moving once you push it. 00:03:07
So Newton was a pretty smart guy. 00:03:13
I mean, he thought of this 300 years before NASA sent astronauts into space. 00:03:15
Once you apply a force, like pushing the PSA, it will move and keep moving. 00:03:20
In fact, the PSA will keep moving even if you turn the fans off and apply no force at all. 00:03:25
Okay, so how do you stop the PSA? 00:03:29
You have to turn the fans on again and apply a force in the opposite direction. 00:03:32
Now you can check out the way the PSA will move on the ISS. 00:03:36
Here's what Newton said. 00:03:42
An object at rest will remain at rest. 00:03:43
An object in motion will remain in motion unless a force acts on it. 00:03:46
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Idioma/s:
en
Materias:
Matemáticas
Niveles educativos:
▼ Mostrar / ocultar niveles
      • Nivel Intermedio
Autor/es:
NASA LaRC Office of Education
Subido por:
EducaMadrid
Licencia:
Reconocimiento - No comercial - Sin obra derivada
Visualizaciones:
386
Fecha:
28 de mayo de 2007 - 16:51
Visibilidad:
Público
Enlace Relacionado:
NASAs center for distance learning
Duración:
03′ 53″
Relación de aspecto:
4:3 Hasta 2009 fue el estándar utilizado en la televisión PAL; muchas pantallas de ordenador y televisores usan este estándar, erróneamente llamado cuadrado, cuando en la realidad es rectangular o wide.
Resolución:
480x360 píxeles
Tamaño:
23.37 MBytes

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