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Forces of Motion

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Subido el 28 de mayo de 2007 por EducaMadrid

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NASA Sci Files segment explaining the different forces of motion including weightlessness, free fall, acceleration, and inertia and how they relate to space travel.

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Hi, kids. Welcome to your astronaut training program. 00:00:00
Astronaut training? I thought we were here to ride roller coasters. 00:00:03
That's exactly right. I want you to be able to experience the thrill of space travel. 00:00:07
And the best way to do it here on Earth is on a roller coaster. 00:00:12
What do roller coasters have to do with space travel? 00:00:16
I know that roller coasters go fast, but not nearly as fast as rocket ships. 00:00:19
That's right. But it turns out the thrill of space travel doesn't come from going at high speeds. 00:00:23
It comes from accelerations. 00:00:28
We've learned before that acceleration is a change in speed or direction. 00:00:30
Precisely. The important point is that forces are needed to cause accelerations. 00:00:34
Remember the law of inertia? 00:00:39
I remember. It states that objects at rest stay at rest and objects in motion remain in motion. 00:00:41
Very good. Let's get this bowling ball rolling. 00:00:47
What if I hit it from the side? 00:00:59
I would guess that it wouldn't change speed. I'm not sure what it would do. 00:01:02
Let's try it. 00:01:06
It changed direction without changing speed. 00:01:08
The same thing happens to the roller coaster car at the bottom of the hill. 00:01:11
It has inertia and wants to maintain its downward motion, 00:01:15
but the track pushes the car perpendicular to its motion and sends it uphill. 00:01:18
What does the push of the track do to the passengers? 00:01:23
It makes them feel heavy. 00:01:25
The faster the coaster is going or the tighter the turn, the heavier they will feel. 00:01:27
How heavy will you feel on a roller coaster? 00:01:31
Here on the Alpengeist, you feel about four times heavier than normal at the bottom of a couple of the hills. 00:01:34
It turns out the space shuttle astronauts only feel three times heavier than normal when the shuttle is taking off. 00:01:39
So you were right. We are going to be in training to be astronauts. 00:01:45
The difference is on the Alpengeist you feel heavy for only a few seconds at a time, 00:01:48
but on the space shuttle you feel heavy for about eight minutes. 00:01:54
Don't astronauts also feel weightless? Will we be able to experience that on the Alpengeist? 00:01:57
You bet. 00:02:02
Once the engines are cut off after about eight minutes and the shuttle goes into orbit, the astronauts are weightless. 00:02:03
Weightlessness is experienced with only gravity acts on an object. 00:02:09
It's called free fall. 00:02:13
Let me show you. 00:02:14
When I jump off this bin, the points of my hat will float as if they're weightless 00:02:15
and this spring hanging from my hand will collapse. 00:02:20
Wow, Dr. D. What you go through to show us how science works. 00:02:25
So where on the coaster ride are we going to be falling? 00:02:29
Free fall is not always down. Remember, it's when only gravity acts. 00:02:32
So when I throw this koosh ball, watch which path it follows. 00:02:36
I've seen that before with the Vomit Comet when we were learning about habitats. 00:02:42
I think it's called a parabola. 00:02:46
Very good. The coaster goes over a parabolic hill and twists at the same time. 00:02:49
For a few seconds, you're weightless. 00:02:53
This is going to be exciting. 00:02:55
Can we go on the ride now? 00:02:57
One more thing. You can tell how heavy you feel by watching this accelerometer. 00:02:58
When you feel three times as heavy as normal, this mass will be pulled onto this point right here. 00:03:03
Einstein told us that being heavy on a roller coaster and being heavy on a big planet are the same thing. 00:03:09
I guess we're preparing for both space travel and visiting an alien planet. 00:03:15
Let's go on the ride. I'm ready to be an astronaut. 00:03:19
Okay, it's good to experience the physics and not just talk about it. 00:03:22
Don't forget to watch the accelerometer and try to figure out where you are when you feel the heaviest. 00:03:26
Come on, let's go. 00:03:31
Here we go. 00:03:33
That was so great. I felt heavy at the bottom of the hills. 00:03:45
I noticed the accelerometer read more than three a number of times, but I lost count. 00:03:49
I noticed I felt weightless a few times. 00:03:54
I had no idea where I was on the ride, but it was exciting. 00:03:56
Thanks, Dr. D. Now we have some practical space travel experience. 00:04:00
You're welcome. You'll be great astronauts. 00:04:04
Oh, I've got to run. See you later. 00:04:06
Bye, Dr. D. Thanks. 00:04:08
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Idioma/s:
en
Niveles educativos:
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Autor/es:
NASA LaRC Office of Education
Subido por:
EducaMadrid
Licencia:
Reconocimiento - No comercial - Sin obra derivada
Visualizaciones:
529
Fecha:
28 de mayo de 2007 - 15:33
Visibilidad:
Público
Enlace Relacionado:
NASAs center for distance learning
Duración:
04′ 12″
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:
25.33 MBytes

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