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Weight and Aerodynamics - Contenido educativo

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Subido el 28 de mayo de 2007 por EducaMadrid

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NASA Connect segment explaining the forces that affect the X-33 and how these forces relate to everyday objects. The video explores weight and aerodynamics and how to design vehicles to become more efficient.

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How can you improve the performance of a bicycle? 00:00:00
Explain two forces that affect both X-33s and a bike's performance, and could you tell 00:00:13
us how they relate to each other? 00:00:18
Okay, so we've collected the baseline information from Van's one-mile test run, and I think 00:00:20
we can all agree that some improvements need to be made. 00:00:25
Now, obviously, we can't change the size of the bike, but, I mean, can't we improve some 00:00:28
of the bike's technologies or something? 00:00:33
Yeah, make it lighter so it's easier to pedal, maybe. 00:00:35
Right. 00:00:38
You can decrease the force that will take the pedal by decreasing the weight of the 00:00:39
bike. 00:00:41
One way that you can do it is to replace the frame with one that is made of a new, lighter, 00:00:42
stronger composite material instead of this heavy steel. 00:00:47
That's something we have to do with the X-33. 00:00:51
We already learned from our subscale testing that both for the X-33 and the larger Venture 00:00:54
Star, we're going to need to use composite materials in order for both of them to reach 00:00:58
space. 00:01:02
You know, it seems to me that part of Van's struggle was the bike's poor aerodynamics. 00:01:03
That's another common challenge the X-33 and your bike share, moving through the air easily 00:01:09
and with less resistance. 00:01:13
A lot of this has to do with the geometry, so the shape of the vehicle is critical. 00:01:15
The X-33 has a wedge-shaped design. 00:01:19
I suggest you look for ways to make the bike more aerodynamic, otherwise you're just fighting 00:01:22
the force of drag. 00:01:27
Drag is simply the resistance of an object caused by the air, in this case, through which 00:01:29
it is moving. 00:01:33
Yeah. 00:01:34
Since X-33 is a flying machine, we also need to generate lift. 00:01:35
That's the force that supports objects as they move through the air. 00:01:38
Well, you can't test that with a test run like mine. 00:01:41
No, but we can simulate it on a computer, or we can run small-scale models in the wind 00:01:44
tunnel. 00:01:49
Oh. 00:01:50
So we can make the bike less resistant to air and gravity, but what else can we do? 00:01:52
One thing you can do is you can make the power source more efficient. 00:01:59
Now on the bike, you're the engine. 00:02:02
Are you sure you're using the gears correctly? 00:02:04
No, I don't even know how they work. 00:02:06
I normally just keep it in third. 00:02:08
Well, you know what? 00:02:09
Let me show you how they work. 00:02:10
It's really easy, and it'll make you a lot more efficient. 00:02:11
Well, Van, those gears are there for a reason. 00:02:14
See, when you are riding or racing bikes, you want to use your energy as efficiently 00:02:17
as possible. 00:02:22
To do this, you need to use your gears correctly. 00:02:23
They will help you pedal at the same rate throughout the race and help conserve your 00:02:26
energy. 00:02:30
For instance, when biking uphill, use a low gear, and when biking downhill or on a flat 00:02:31
road, use a higher gear. 00:02:36
Like the gears on your bike, the X-33 will also make the most efficient use of the environment 00:02:39
by using two revolutionary linear aerospike engines. 00:02:44
That's so cool. 00:02:47
Hey, let's head to Cookville, Tennessee. 00:02:49
There, we're going to meet some students who are making their own models of the X-33. 00:02:51
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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:
337
Fecha:
28 de mayo de 2007 - 16:52
Visibilidad:
Público
Enlace Relacionado:
NASAs center for distance learning
Duración:
02′ 56″
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:
17.66 MBytes

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