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Electricity and Magnetism - Contenido educativo

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Subido el 28 de mayo de 2007 por EducaMadrid

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NASA Connect segment explaining how NASA is using electricity and magnetism to propell spacecraft into orbit. The segment also explains acceleration, mass, and force in an algebraic equation.

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Hey there, welcome to NASA Connect, the show that connects you to the world of math, science, 00:00:00
technology, and NASA. 00:00:09
I'm Van Hughes. 00:00:11
And I'm Jennifer Pulley. 00:00:12
Today, we're at Disney MDM Studios in Orlando, Florida. 00:00:13
We are your hosts, along with Norbert. 00:00:17
Every time Norbert appears, have your cue cards from the lesson guide and your brain 00:00:19
ready to answer the questions he gives you. 00:00:23
And two-thirds. 00:00:26
Every time Norbert appears with a remote, that's your cue to pause the videotape and 00:00:27
discuss the cue card questions he gives you. 00:00:31
Fasten your seatbelts. 00:00:33
On today's show, we'll learn how NASA researchers collect and measure data, recognize patterns, 00:00:34
develop functions, and use algebra to solve their problems. 00:00:41
Then, they compare the results and predict how the technology will perform in space. 00:00:44
Plus, you will simulate NASA research and learn all about magnetic forces and how they 00:00:49
cause motion. 00:00:55
And you know what? 00:00:56
You're going to be doing all of this in your classroom. 00:00:57
It's going to be a thrilling ride. 00:00:58
Later, Dr. Shelley Canright will get you hooked up to this show's web activity. 00:01:00
Today's NASA Connect program features patterns, functions, and algebra to get you wired for 00:01:05
space. 00:01:10
Did you know that NASA researchers use math, science, and technology every day to make 00:01:11
sure space transportation is safe and reliable? 00:01:16
That's right, and more affordable, too. 00:01:19
You know, NASA Connect has sent us on some pretty cool locations, but Disney MGM's rock 00:01:21
and roller coaster starring Aerosmith is definitely a gas. 00:01:27
Gas? 00:01:31
Not gas, man. 00:01:32
This coaster uses state-of-the-art electromagnetic motors. 00:01:35
Electromagnetic? 00:01:39
You mean, this roller coaster runs on electricity and magnetism? 00:01:40
Exactly. 00:01:45
Electricity is one of the fundamental forces of nature that we use to make things work 00:01:47
for us. 00:01:53
Magnetism is the force of attracting or repelling magnetic materials. 00:01:54
Magnets have the power to pull things toward them, but they can also push or repel things 00:01:59
away. 00:02:04
When you connect the power of electricity with the strength of magnetism, you can make 00:02:05
an electromagnetic motor, like the one that gets your clothes clean in the washer. 00:02:09
Today, we're learning how electricity and magnetism are used for what you might call 00:02:14
another type of spin cycle, propelling spacecraft into orbit. 00:02:19
Zero to 60. 00:02:23
Oh, man. 00:02:24
2.8 seconds. 00:02:25
That was so awesome. 00:02:26
I mean, that's tense. 00:02:27
Now tell me, how does a roller coaster like this relate to NASA and spacecraft? 00:02:28
Not that I'm complaining, but I want to ride it again. 00:02:33
Well, okay, we will. 00:02:35
Hang on, let me tell you. 00:02:36
NASA is working on a way to propel spacecraft into orbit, and get this, they're using a 00:02:37
track very similar to this roller coaster track. 00:02:41
All right, all right. 00:02:44
Hey, let's propel ourselves over to NASA Marshall Space Flight Center in Huntsville, Alabama, 00:02:45
and check it out. 00:02:51
Jennifer, this is supposed to be like a roller coaster? 00:02:53
Where are the loops? 00:02:58
Well, it's not like a roller coaster in that way, Van, but it does use some of the same 00:02:59
scientific principles. 00:03:03
This is Jose Perez. 00:03:04
He's the Launch Assist Project Manager from Kennedy Space Center in Cape Canaveral, Florida. 00:03:06
Thanks, Jennifer. 00:03:11
Going into space is expensive, and the first part of the trip costs the most. 00:03:13
That's where this track comes in. 00:03:18
It is used for magnetically propelling a spacecraft. 00:03:19
Like magnets, electricity has a similar push and pull called charges. 00:03:23
In fact, electricity and magnetism are a lot alike because they are really the same force 00:03:27
of nature. 00:03:32
We're just used to thinking of them as two different things. 00:03:33
That's where maglev, or magnetic levitation, comes in. 00:03:37
Okay, so what is magnetic levitation? 00:03:40
Magnetic levitation, or maglev, is a new technology being developed for high-speed trains. 00:03:44
Instead of running on metal wheels, these new trains float or levitate above the track. 00:03:50
Levitate? 00:03:54
Yeah, how does that happen? 00:03:55
Well, electromagnets in the track levitate and propel the vehicle down the track without 00:03:57
any direct contact. 00:04:02
Cool, I get it. 00:04:04
So charges are like magnetic poles that repel each other and pushes it down the track. 00:04:06
Exactly. 00:04:11
The magnetically levitated spacecraft will leave the track traveling around 600 miles 00:04:12
per hour, and then reach orbit using rocket power. 00:04:16
What kind of tests did they use? 00:04:19
Were there any patterns in the results? 00:04:23
What kind of graph? 00:04:27
We sawed it from the data. 00:04:28
One of the things that we test is how much force is being produced by our electromagnets. 00:04:30
To find the force, we use this equation, F equals m times a, where F is the force, m 00:04:36
is the mass, and a is the acceleration. 00:04:44
Acceleration is the increase of speed over time. 00:04:49
We put sensors aboard our test vehicle that measure its acceleration. 00:04:52
Since we already know the mass of our test vehicle, if we multiply the acceleration by 00:04:57
the mass, we can determine the force. 00:05:03
Taking those numbers and producing line graphs, we can show the forces on our test vehicle. 00:05:06
The pattern that develops helps us predict the performance for future space vehicles. 00:05:12
Wow, that's a pretty exciting way to understand math. 00:05:17
You use math every day, right? 00:05:21
Yes, and we also share our results with people in industry and other NASA centers. 00:05:23
By looking at our results, they can understand how much the carrier is accelerating and how 00:05:28
much force the track magnets are generating. 00:05:33
Because we speak the common language of mathematics, we can share what we learn, and we learn from 00:05:36
each other. 00:05:41
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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:
391
Fecha:
28 de mayo de 2007 - 16:53
Visibilidad:
Público
Enlace Relacionado:
NASAs center for distance learning
Duración:
05′ 42″
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:
34.29 MBytes

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