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Unit 5 Natural Science

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Subido el 11 de mayo de 2020 por Laura A.

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Hello everyone, this is a video in which we are going to continue with the Unit 5 of Natural Science. 00:00:00
So let's gonna start checking what we learned in the previous unit. 00:00:09
So I'm just gonna read it for you. 00:00:15
Sorry, in the previous unit, no, in the previous part of the topic. 00:00:18
So we learned about light. 00:00:22
And we learned that light is a form of energy that lets us see objects. 00:00:26
So, thanks to light we can observe their size, shape and color. 00:00:32
So, here we continue and we discover that we have two different types of light sources, 00:00:39
which are the natural one and the artificial one. 00:00:47
The natural one came from natural sources, of course, 00:00:50
examples, the sun 00:00:55
or the lightning 00:00:58
los rayos, los relámpagos 00:00:59
right? light 00:01:02
can also come from artificial 00:01:04
sources such as light bulbs 00:01:06
and wax candles, las velas 00:01:08
right? 00:01:10
talking about the properties of light 00:01:13
of the characteristics of 00:01:16
light, we have to mention 00:01:17
three aspects, the first one 00:01:19
is the speed, since light 00:01:22
travels very quickly, right? 00:01:24
is the fastest form of energy in the universe, right? 00:01:26
La velocidad de la luz. 00:01:30
Color, while white light is not really white. 00:01:31
No, color has, light has seven colors, 00:01:36
the ones that we can find in the rainbow. 00:01:41
And the direction, right? 00:01:44
The light travels in a straight line 00:01:46
until it hits something. 00:01:50
When it hits something, 00:01:53
Some materials can absorb that light and others can reflect it in a new direction, right? 00:01:54
Reflect the light and change the direction of it. 00:02:02
How the light happens, the artificial one? 00:02:07
When you light a candle, there is a chemical reaction because the candle burns and reacts with the oxygen that we have in the air. 00:02:13
If we don't have oxygen, we cannot have a candle lighting, right? 00:02:20
Similarly, when you turn the torch, right? 00:02:26
When you turn on a torch that is powered with a battery, 00:02:31
a chemical reaction takes place inside the battery. 00:02:35
So that chemical reaction is the one that generates the energy, right? 00:02:38
That's the reason why the torch lights up. 00:02:44
So let's go to move to the next page. 00:02:48
So in this page, we are going to learn about the different types of material and their relationship with the light. 00:02:52
So we have transparent materials, translucent materials and opaque materials, right? 00:02:59
Transparent materials are the ones that let light pass through them, right? 00:03:06
For instance, the glass of your window, right? 00:03:12
You can see clearly what is behind the glass, the window, right? 00:03:15
We also have translucent materials that they let some light pass through them, 00:03:22
but we can see what is behind, but it's not clear, right? 00:03:31
And it's this one. In Spanish, I think it's translúcido, right? 00:03:37
And opaque materials are the ones that do not let light pass through them, right? 00:03:42
A curtain, if you put a curtain at home, or the, I don't know, just a wooden thing outside, right? 00:03:50
So you cannot see what is on the other part of the object, right? 00:04:01
It's really easy, something that you know. 00:04:07
What about the colors? As I told you previously, the sunlight looks like it's white, but it has seven colors, and we have an experiment to see the different colors of light, right? 00:04:11
So light is made up of seven colors, right? The ones that we can find in the rainbow. 00:04:27
So when light hits an object, some colors are absorbed and some are reflected, right? 00:04:33
we only see the colors that are reflected, right? For example, 00:04:40
a tomato only reflects red light and absorbs all the other colors, right? 00:04:46
That's interesting. It's going to, well, I will tell you the activities you have to 00:04:51
do later on. So we are going to move to this new page. I'm gonna make it bigger 00:04:58
for you. So here we have the concepts of reflection and refraction. Reflection occurs 00:05:04
when light hits an object and bounces in another direction and refraction occurs 00:05:13
when light changes the direction and it passes from one material into another, right? 00:05:20
So now we have the concept of reflection. When light hits a smooth surface 00:05:26
all the rays reflect in one direction. As a result, smooth surfaces reflect clear images, 00:05:34
right? But when light hits a rough surface, the rays reflect in many directions. As a result, 00:05:42
rough surfaces do not reflect very clear images, right? And what about the refraction? 00:05:51
Refraction happens when light changes the direction as it passes through a material. 00:05:58
Think of a straw in a glass of water. The straw appears to bend where it enters 00:06:05
the water. This is because the air and water are materials that have different densities. 00:06:14
this is the one that you experienced with the experiment 00:06:20
because at the end of the video I record for you 00:06:27
you have the situation in which I introduced a pen into the water 00:06:29
so you were able to observe what happened 00:06:38
the ones that you have here in this picture, right? 00:06:44
And why mirror and lenses are important here? 00:06:47
Because mirror are the best reflectors, right? 00:06:52
They reflect all the light that hits them, sorry, and they form very clear images of anything that is in front of them. 00:06:55
So that is how a mirror works. 00:07:05
But lenses are pieces of curved glass of plastic that reflect light, right? 00:07:08
We can find them in many objects, such as glasses, cameras, and binoculars, right? 00:07:14
Lenses can make objects look bigger or smaller, right? 00:07:20
So, let's go into move, because we will continue with the next point of the unit, which is new for you. 00:07:25
So, this is the new part of the unit, is the concept of heat. 00:07:36
It's not new for you because in the previous unit, the one related to the sources of energy, 00:07:40
we were talking about it and we talked about this, about the thermal energy. 00:07:45
So it's not new for you, but we are going to learn some other aspects related to it. 00:07:52
So when we heat an object, we add thermal energy. 00:07:57
Thermal energy moves from warmer objects to cooler objects, right? 00:08:01
Remember how the heating works, right? 00:08:06
This flow of thermal energy is called heat. 00:08:10
So, if you are asked about heat, you can get the definition of heat that is on this page. 00:08:14
I'm just going to underline it for you because it's new. 00:08:22
Flow of thermal energy and heat, right? 00:08:27
And important, thermal energy moves from warmer objects to cooler objects. 00:08:32
right yes i want to save the changes right conductors and insulators one of the properties 00:08:39
of material is how well they conduct heat thermal conductors transfer heat very well 00:08:50
metals such as copper and aluminium are excellent excellent conductors so we use them to make 00:08:58
cooking pots and pans. They conduct heat from the cooker to the food very quickly. 00:09:05
Thermal insulators do not transfer heat very well. Some examples are wood, plastic and wool. 00:09:19
When we wear woolen gloves on a cold day, only a little heat escapes through the wool, 00:09:27
so our hands stay warm. So we also have the cooking gloves, the ones that when we 00:09:33
are taking something from the oven we use special gloves, so it's because they 00:09:40
are thermal insulators too, right? They are made of a material which is thermal 00:09:46
insulator. That's the correct sentence, right? So it's something really easy for you to 00:09:52
know? What are thermal conductors and what are thermal insulators, right? 00:09:59
Effects of thermal energy. When we add thermal energy to a substance, there can 00:10:05
be a change of state or volume, right? Think about the ice, for instance. 00:10:12
Melting. The thermal energy of a solid increases and it changes to a liquid. 00:10:18
Here we have the example of the butter. You can see, yes, it was cold 00:10:24
and it was forming like a solid cube, right? But now it's just like an oil, it's a liquid. 00:10:29
Evaporation, the thermal energy of a liquid increases and it changes into a gas, right? 00:10:40
Something really easy for you because you have learned about it in previous years in the previous 00:10:47
unit and expansion. When the thermal energy of a substance increase, its 00:10:53
volume increases. So, this is the end of the unit because the next point is that 00:10:58
related to something to learn more. I would like you to have a look on it, 00:11:06
right? But you have learned about it in the social science units related to the 00:11:13
population because you have an activity that I think was in the Genially related 00:11:21
to light and night light and and the population right so you here says get 00:11:31
to pearls, you can't do it, so just read the text A and B. The B is on page 95, right? And you can 00:11:45
learn about it, right? About artificial light, the light that we can see during the night, right? In 00:11:56
the cities, right? But what I would like you to do, sorry, is to do the following activities. 00:12:02
Let's move to the review. And you are going to do the following activities. Take notes. 00:12:10
Copy your graphic organizer in your notebook and classify the words from the box below. I want you 00:12:24
to do this one because it helps you to create mind maps in the future or to learn how to do 00:12:34
them because we are starting creating mind maps the class right so please do 00:12:39
the first one copy the boxes please please clean clean use the ruler you 00:12:44
need it use different colors use the complete page don't do it just in a 00:12:52
small corner of it right the activity the two and three you don't have to do 00:12:56
because I prefer you to focus on these ones on the far right so you have to 00:13:07
decide whether these words are a source a natural light sources or artificial 00:13:17
light sources because you will have a similar activity on the exam five right 00:13:24
you just have to copy the ones that are true, but I don't want people writing false, false, 00:13:32
false, false, false, false, false, false, false, no, right? So, do it correctly because if not, 00:13:40
you will repeat it, as simple as that, right? Because when you have to copy just the true ones, 00:13:46
you write in all of them false, false, false, false, false, and I did a homework, no, 00:13:52
it doesn't work for me, no, no me vale, no funciona 00:13:56
right, this is six 00:14:00
describe what is happening in the photos, this is very easy because you just have to write 00:14:04
A, a word, B, and a word, right 00:14:09
and so we have to do one 00:14:11
four, five, six 00:14:16
and nine, that's all, right 00:14:20
those are the activities that you have to do, I don't have more time 00:14:26
if you have any doubt just let me know and that's all 00:14:31
I don't have more time, right? Please study for the exam 00:14:35
the exam will be during the connection so you won't copy it 00:14:39
on it, so please study because it's something positive 00:14:43
for you, right? And I'll see you on Wednesday 00:14:47
Bye! See you! 00:14:51
Subido por:
Laura A.
Licencia:
Todos los derechos reservados
Visualizaciones:
87
Fecha:
11 de mayo de 2020 - 10:27
Visibilidad:
Clave
Centro:
CP INF-PRI AMADOR DE LOS RIOS
Duración:
14′ 56″
Relación de aspecto:
2.10:1
Resolución:
1360x648 píxeles
Tamaño:
53.67 MBytes

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