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Night Visibility Experiment

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Subido el 28 de mayo de 2007 por EducaMadrid

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NASA Sci Files segment involving students in an experiment that studies night visibility and reflective surfaces.

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Hi, my name is Erica Hartley from Mr. Mark Bumita's third grade class in Riverside, Ohio. 00:00:00
We are proud to be an AIAA school, which stands for American Institute of Aeronautics and Astronautics. 00:00:08
We need your help. Can you tell us about your experiment on reflective surfaces? 00:00:17
Sure. We started off with the problem. We needed to find the most visible material for bike safety at night. 00:00:21
That's so funny. We have the same problem. What did you do? 00:00:29
We did a fun experiment. It's really easy. We tested four items. 00:00:32
A five centimeter by ten centimeter piece of white poster board with fluorescent paint, 00:00:37
a glow stick, a neon pink poster board strip, and a reflective sticker. 00:00:44
I've seen this experiment before. First you start by taking a piece of clay and dividing it into four equal parts. 00:00:51
Then you take the clay and roll it into small balls. 00:00:56
And then you set the balls on the table in a straight line about eight centimeters apart. 00:00:59
Then you take each test item and insert it into the balls of clay. 00:01:04
How did you do the test? 00:01:08
It's easy. Shine a beam of light on the first item and observe. 00:01:10
Then record your observations on your data sheet. 00:01:16
After you conduct the experiment, give each item a safety rating. 00:01:21
Number one stands for poor visibility and number five means the item is very visible at night. 00:01:26
Did you find out which items work best for bike safety at night? 00:01:33
Yes. We came up with several findings from our data chart. 00:01:37
We found the neon pink paper, like this one here, is noticeable, but it doesn't reflect light. 00:01:42
The glow stick produced its own light and was really visible, but it can only last for so long. 00:01:50
Yeah, the glow sticks only work for ten hours and it only gives off light. It doesn't reflect it. 00:01:57
The fluorescent paint doesn't really glow at all. 00:02:03
Our top score is the reflective sticker. It reflects light well and it's good for night visibility. 00:02:07
We hope this helps you. 00:02:15
Bye! 00:02:17
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Idioma/s:
en
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:
294
Fecha:
28 de mayo de 2007 - 15:33
Visibilidad:
Público
Enlace Relacionado:
NASAs center for distance learning
Duración:
02′ 20″
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:
14.10 MBytes

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