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Subido el 28 de mayo de 2007 por EducaMadrid

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NASA Sci Files segment explaining how elevators work.

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Hello, we're the Treehouse Detectives, and we need to learn more about elevators. 00:00:00
Well, you've come to the right place. 00:00:12
I'm Edith DeFrancesco, Vice President of Product Development here at Otis Elevator Company. 00:00:14
Wow, that sounds interesting. 00:00:18
Do you actually build elevators? 00:00:21
Here at the test tower, we test elevators for safety and efficiency, and I don't personally 00:00:22
build elevators, although as a mechanical engineer, I've worked on elevator designs. 00:00:26
You're an engineer? 00:00:31
I'm doing a report on engineers for Career Day. 00:00:32
Great, I'll show you where we design and test our elevators. 00:00:34
We have lots of engineers working on elevator design. 00:00:37
This is our test tower. 00:00:44
After we design the elevators, we bring them here to test them, to see how they will work 00:00:45
when they're installed. 00:00:49
How do elevators work? 00:00:50
Elevators are driven by electric motors, and on the motor shaft is a pulley called 00:00:52
a shiv. 00:00:56
Over the shiv hang steel cables. 00:00:57
It's basically a box on a rope. 00:01:00
On one end of the cable is the elevator car, which carries the people, and on the other 00:01:02
end is the counterweight. 00:01:06
What's a counterweight? 00:01:07
A counterweight is a steel frame full of weights, and it balances the weight of the elevator 00:01:08
car and the people in it, so that it takes less force to move the elevator. 00:01:13
How does it reduce the amount of force needed? 00:01:17
Think of it like a balance scale. 00:01:19
The force needed to turn the shiv is related to the difference between the weight of the 00:01:20
car, with the people in it, and the weight of the counterweight. 00:01:24
The closer those two are in weight, the more balanced the system is, and the easier it 00:01:27
is to turn the shiv. 00:01:32
How does an elevator go up and down? 00:01:33
Well, when the motor turns, the shiv rotates. 00:01:36
The cables stay on the shiv in these grooves, and with the friction between the cables and 00:01:38
the shiv, the cables move with the shiv when it rotates, making the elevator go up and 00:01:42
down. 00:01:47
Sounds like friction's a good thing to have in an elevator. 00:01:48
Yes. 00:01:50
We call it traction, and it's very important. 00:01:51
We don't need a very big elevator for our treehouse. 00:01:54
Do elevators come in different sizes? 00:01:56
Yes, they can be as small as a dumbwaiter, about a half a meter by a half a meter. 00:01:58
How big can an elevator be? 00:02:02
Some elevators are as big as a truck. 00:02:04
They're used to carry freight containers and seaports, but a typical commercial elevator 00:02:05
is about a meter by two meters, and carries ten or twelve people. 00:02:10
Designing an elevator seems like a lot of work. 00:02:13
It sounds like a lot of fun. 00:02:15
It has its ups and downs. 00:02:17
Thanks, Mrs. DeFrancesco. 00:02:19
We've learned a lot about elevators. 00:02:20
You're welcome. 00:02:22
And if you have any more questions, just give me a call. 00:02:23
Bye. 00:02:25
Bye. 00:02:26
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Idioma/s:
en
Niveles educativos:
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      • Nivel Intermedio
Autor/es:
NASA LaRC Office of Education
Subido por:
EducaMadrid
Licencia:
Reconocimiento - No comercial - Sin obra derivada
Visualizaciones:
599
Fecha:
28 de mayo de 2007 - 15:32
Visibilidad:
Público
Enlace Relacionado:
NASAs center for distance learning
Duración:
02′ 28″
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:
14.96 MBytes

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