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The Scientific Method
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NASA Why? Files segment describing the scientific method.
Hey, Dr. D. I think he can hear you. You're so loud.
00:00:00
Hi, guys. What brings you over? You look a little tired.
00:00:05
Some of us are very tired. We didn't get any sleep.
00:00:09
Both of our dogs were barking last night.
00:00:12
Dr. D., did Bernie bark last night?
00:00:15
Nah, you know Bernie. He's a little old. It's not like he's really out of it.
00:00:18
Did Bernie ever bark?
00:00:22
Oh, yeah, sure. Especially when he would smell or hear something he wasn't familiar with.
00:00:24
He'd start barking to scare it off.
00:00:28
So could there be a strange smell in the air that's making all of the dogs in the neighborhood start barking?
00:00:30
Could be. I thought the trios detectives would be back working on another problem.
00:00:35
So I made up this board.
00:00:40
Oh, the scientific method. I'll let you in on a little something.
00:00:42
The scientific method really helps you to solve problems.
00:00:46
Well, it helped us with the sink problem.
00:00:49
Remember, the scientific method is a step-by-step way to solve problems.
00:00:52
You can use it every day.
00:00:56
Oh, it's all coming back to me now.
00:00:58
I have something fun to show you that will help us review the scientific method.
00:01:00
Let's go to my lab and try it out.
00:01:03
Okay.
00:01:05
Does anyone know what this device is called?
00:01:10
I've seen one before, but I don't know what it's called.
00:01:12
Well, it's called a Newton's cradle.
00:01:14
If you wanted to find out how it worked, what would you do?
00:01:16
I guess I'd play around with it.
00:01:18
If we're following the scientific method, then the first thing we would do is to identify the problem.
00:01:20
And, of course, we'd have to observe it.
00:01:25
Well, you're observing it already by playing with it.
00:01:27
What do you think we can say is the problem?
00:01:30
Well, I noticed that when I pull this ball back and then release it, another ball pops out.
00:01:32
Does that happen every time?
00:01:37
And what about two balls?
00:01:39
That's the problem.
00:01:41
Remember, a problem has to be stated in the form of a question.
00:01:43
So our problem is, what happens to the balls on the other side when I pull back a certain number of balls?
00:01:46
Isn't the next part of the scientific method research?
00:01:51
Yeah, that's correct.
00:01:54
Oh, I like this kind of research.
00:01:55
Let's see what happens when I pull back two balls.
00:01:57
I'll collect data.
00:01:59
Whoa, wait a minute. Don't forget, we have to control the variables.
00:02:01
All the variables are the same except for one.
00:02:04
So pull back your two balls the same distance that Jacob pulled back his one.
00:02:07
That's right. I forgot about those variables.
00:02:11
Wait, what happens if I do three balls?
00:02:14
Are we ready for our hypothesis yet?
00:02:17
I know the hypothesis.
00:02:19
When you let go of two balls, two balls come out.
00:02:21
And if you let go of three balls, three balls come out.
00:02:23
That's right. Remember, the hypothesis has to be written so it can be tested.
00:02:26
For example, the same number of balls I pull back will come out on the other side.
00:02:29
Okay, are we ready to experiment yet?
00:02:34
That's my favorite part.
00:02:36
Okay, let's test the hypothesis.
00:02:38
Let's see what happens.
00:02:40
If I pull back four balls, then four balls should come out on the other side.
00:02:41
Wow, our hypothesis was correct.
00:02:52
Congratulations.
00:02:55
But remember, the data does not support the hypothesis you have to try again.
00:02:57
But how do we observe for our problem of the barking dogs?
00:03:01
We can't stay up all night waiting for the dogs to start barking.
00:03:04
Well, we could.
00:03:07
Not me. Remember, I have that big test next week.
00:03:09
I think we need to go back to the tree house to talk about this problem.
00:03:12
And then we need to decide what we want to research.
00:03:15
Thanks for all your help, Dr. Dean.
00:03:18
See you, Dr. Dean.
00:03:20
Bye-bye, guys.
00:03:21
- Valoración:
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- Idioma/s:
- Niveles educativos:
- ▼ Mostrar / ocultar niveles
- Nivel Intermedio
- Autor/es:
- Office of Education
- Subido por:
- EducaMadrid
- Licencia:
- Reconocimiento - No comercial - Sin obra derivada
- Visualizaciones:
- 597
- Fecha:
- 28 de mayo de 2007 - 15:32
- Visibilidad:
- Público
- Enlace Relacionado:
- NASAs center for distance learning
- Duración:
- 03′ 24″
- 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:
- 20.44 MBytes
