Saltar navegación

Activa JavaScript para disfrutar de los vídeos de la Mediateca.

Airflow Algebra and Geometry - Contenido educativo

Ajuste de pantalla

El ajuste de pantalla se aprecia al ver el vídeo en pantalla completa. Elige la presentación que más te guste:

Subido el 28 de mayo de 2007 por EducaMadrid

451 visualizaciones

NASA Connect Segment explaining air flow. The video describes how drag, lift, and thrust work.

Más información Transcripción

Descargar la transcripción

Okay, here's the deal. 00:00:00
Van and I are gonna conduct a little experiment about drag 00:00:02
using go-karts. 00:00:05
Van and I are riding in the same kind of go-kart 00:00:10
with the same amount of fuel. 00:00:13
These are constants. 00:00:14
However, Van is taller and heavier than I am. 00:00:16
These two variables, height and weight, 00:00:19
might affect the race. 00:00:22
And hopefully, I'll cross the finish line first. 00:00:23
I am the superior driver. 00:00:26
I can't change my weight. 00:00:29
But if I change the variable of being taller 00:00:31
and crouch down and become more streamlined, 00:00:34
I might have a chance. 00:00:36
No way! 00:00:51
How did you win? 00:00:53
Let me explain, Jennifer. 00:00:55
I changed my shape, which allowed the air to flow 00:00:57
more smoothly around me. 00:00:59
Your shape interrupted the airflow and caused drag. 00:01:01
This slowed you down and allowed me to win. 00:01:04
So, what is drag? 00:01:12
Drag is the force that opposes or resists motion. 00:01:14
The interruption or resistance to airflow causes drag. 00:01:17
You've probably experienced drag when you've ever 00:01:20
stuck your hand out the window of a moving car. 00:01:22
When you extend your arm like this, 00:01:25
with your palm forward, 00:01:27
the force of drag pushes your hand back. 00:01:29
But when you tilt your hand like this, 00:01:31
it creates lift and lifts your hand upward. 00:01:33
Lift and drag are a few of the aerodynamic forces 00:01:36
that act on an airplane when it flies. 00:01:39
How do airplanes fly? 00:01:41
Well, to understand flight, 00:01:43
you must first understand air. 00:01:45
We are surrounded by air all the time, 00:01:49
and we can't feel it because 00:01:54
the air pressure is equal on all sides of our body. 00:01:56
But what if we change the air pressure 00:02:00
on one side of an object? 00:02:03
Check out this cool experiment. 00:02:05
Hey, why did the paper lift up 00:02:11
when I blew across the top? 00:02:13
Well, when the paper is resting against my chin like this, 00:02:15
the air pressure on top is equal 00:02:18
to the air pressure on the bottom. 00:02:20
But when I blow, 00:02:22
I change the air pressure on the top. 00:02:24
The shape of the paper in its original position 00:02:26
is kind of like an airplane's wing. 00:02:29
It is curved on the top. 00:02:31
Because of this shape, 00:02:33
air molecules move faster across the wing's top 00:02:35
than across its bottom. 00:02:37
Swiss mathematician Daniel Bernoulli 00:02:39
discovered that faster-moving fluids, 00:02:41
such as air, 00:02:43
exert less pressure than slower-moving fluids. 00:02:45
Because of its shape, 00:02:48
the air on top of the wing moves more quickly 00:02:50
and exerts less pressure. 00:02:52
When the pressure on top of the wing 00:02:54
is less than the pressure under the wing, 00:02:56
lift is produced, and the airplane flies. 00:02:58
What does all this have to do with algebra and geometry? 00:03:01
Everything! 00:03:04
Geometry is the study of shape and size. 00:03:06
Geometry was probably first developed 00:03:08
to help measure the Earth and its objects. 00:03:10
Knowledge of geometry helps you better understand things 00:03:13
like engineering and science. 00:03:16
Algebra is a mathematical tool for solving problems. 00:03:18
Learning algebra is a bit like learning to read and write. 00:03:21
Knowledge of algebra can give you more power 00:03:24
to solve problems and accomplish what you want in life. 00:03:27
At NASA, engineers use algebra and geometry 00:03:30
when they measure and design models 00:03:33
to be tested in wind tunnels. 00:03:35
Like today's NASA engineers, 00:03:37
Orville and Wilbur Wright used algebra and geometry. 00:03:39
By blowing a certain amount of air 00:03:42
over models in a wind tunnel, 00:03:44
they tested and compared different wing shapes, 00:03:46
rudder shapes, and propeller shapes. 00:03:49
Hey, let's conduct an experiment 00:03:51
very similar to the Wright brothers 00:03:53
and test different shapes for drag. 00:03:55
Good idea, Van, but first, teachers, 00:03:57
make sure you check out the NASA Connect website 00:03:59
and download the lesson guide for today's program. 00:04:01
In it, you'll find step-by-step instructions 00:04:03
and analysis questions for today's classroom activity. 00:04:05
Van? 00:04:07
Valoración:
  • 1
  • 2
  • 3
  • 4
  • 5
Eres el primero. Inicia sesión para valorar el vídeo.
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:
451
Fecha:
28 de mayo de 2007 - 16:51
Visibilidad:
Público
Enlace Relacionado:
NASAs center for distance learning
Duración:
04′ 08″
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:
24.81 MBytes

Del mismo autor…

Ver más del mismo autor

EducaMadrid, Plataforma Educativa de la Comunidad de Madrid

Plataforma Educativa EducaMadrid