Accesibilidad
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Evidencia de elementos de accesibilidad (video)
hello again okay let's go and the last session of the week okay and the last part of the booklet so
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get ready put your eyes over here with me and your ears over here with me and let's go okay
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today we're going to talk about thermal energy when you think about thermal energy you can think
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about temperature, and you can think about thermometer. What is a thermometer? It's the
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instrument that measures your temperature. That's a thermometer. Right now, we use it
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every day. Okay. What else? Before we start talking about thermal energy, besides temperature
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and thermometer, we have to distinguish two words, okay? So you understand the explanation.
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The first one is going to be heat.
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And heat, we're going to use it as two different types of words.
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Look, we're going to use it as a noun, okay?
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We don't say name.
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We say noun in English, okay?
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Un nombre.
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The sun gives heat.
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It gives temperature, okay?
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There is the sun.
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And then as a verb, I am going to heat, to heat my cat.
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Let's see.
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Oh, man.
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Poor cat.
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okay and the other word is hot okay hot where you're going to use it as an adjective you get
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burned when something is hot for example look over here look what happens there
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i am over there i'm gonna have my coffee
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ooh you get burned when something is very hot okay so remember heat as temperature
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heat as verb okay and then when something is hot let's continue let's see where i am
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here right here okay so thermal energy is produced when heat okay when the temperature
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of something is transferred between objects that are at different temperatures, okay?
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You're going to see an example. Here we have coffee, okay, and ice. The coffee is hot and the
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ice is cold. So over here, the definition is that thermal energy is produced when heat is transferred
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between two objects, coffee and ice, that are at different temperatures, hot and cold, okay?
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Now, this is very important, guys, okay? Take a picture of this because you have to memorize this.
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But for this, you have to understand it, okay? It says heat is always transferred. That means that
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it always goes from the object with the highest temperature, from the hottest object, to the
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object with the lowest temperature, to the coldest, okay?
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So imagine, here's a picture.
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Let me get here on the side, okay?
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This is the hot object, and this is the cold object.
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So heat is transferred, goes from the hot object, from the object with the highest temperature to the object with the lowest temperature, the coldest one, okay?
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In the example of the coffee, the heat from the coffee, which is the hot object, goes to the ice cubes, which is the cold object, and that's why they melt, okay?
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Let's understand it a little bit better with different things.
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Okay, we said that we have two pages over there in your booklet.
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One that talks about thermal effect, where you're going to have to say that thermal is produced when heat transfers between objects that are at different temperatures.
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And then you also write over there that heat goes always from the hottest object to the coldest.
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object okay understand okay let's see when two objects exchange that heat okay
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things can happen let's see what things can happen one of it is temperature
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variation if you take a look there's a bottle of water that the water looks
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that it looks cold okay and the hand I'm sure that this example it's familiar to
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you what happens when you have in your hand a bottle of cold water and your
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hand is hot think about it hot cold what happens to the temperatures of your hand
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and the temperature of the bottle are you thinking okay what happens to the
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temperature of the hand and what happens to the temperature of the bottle when
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they are in contact. This is what we call temperature variation. But don't worry because
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you're going to see an example. Another thing is, another effect that happens with the temperature
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between objects is that it changes of state. And this I'm sure that you have seen it years
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before. There are three states of matter, solid, liquid, and gas. And from a solid to
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a liquid, I have to do something over there. And from a liquid to a gas, I have to do something
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over there too okay and the last one is expansion and contraction so these three effects you have
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them in your book do not worry because i'm going to explain them better and make sure you understand
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it okay so pay attention okay the first one temperature variation variation is change it's
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the same as change so the temperature changes okay oops there's a mistake here the computer
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always changes this word from temperature to temperatura in spanish i hate it okay let's see
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imagine you have a chair made up of ice a chair made of ice and you sit down
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there i go okay now think about the two objects that we have okay and what temperature they have
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so the person in this case my emoji is the warm object okay and the chair made of ice is the cold
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object we said in the beginning that the temperature goes from the hottest object
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to to the coldest object okay it goes like that it transfers it goes from the hottest object to
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the coldest object so what happens with the temperatures of the person and the chair what
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happens let's see it so when the when the temperature goes from the from the person
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to the chair what happens with the person with the temperature the consequence is that the temperature
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of the person goes down or decreases which is the same okay and what happens to the temperature of
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the chair think well what happens is that the temperature goes up or rises
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okay are you understanding I'm going to let you think about it maybe I'm going
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too fast a person and a chair made of ice the person gives the heat to the
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eyes as a consequence the temperature of the person is colder and the temperature
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of the chair is warmer and it would end up melting of course okay okay now the
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second heat effect changes of state we said solid liquid and gas watch this
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video
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Ta-da! Hello, kids! I miss you a lot.
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Anyway, I'm going to show you what I just talked about, okay?
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Now think. What do you think it will happen if I put a piece of ice in this container?
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And then I put it over here where this, let's click over here, gets hot.
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Watch this.
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Now it's turning red and I feel the heat over there.
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Okay.
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What do you think it'll happen?
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This is my piece of ice.
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And.
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Uh, here? Look what's going to happen. It's a solid right now, huh? See the heat? It's a survey.
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Wake up.
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Oh, oh, it's turning into liquid.
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now second question now that it's a liquid what do you think it will happen if I continue heating it
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let's see
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can you see the smoke
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Shh, this is steam.
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Water vapor.
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So the heat is going from the cooker.
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Oh, look at that! It's boiling!
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Let's leave it there.
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Boiling, boiling.
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What do you think it'll happen if I continue boiling it?
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Solid?
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Liquid?
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Oh man.
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There's less liquid now.
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Look guys.
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It has disappeared.
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It's liquid now.
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Look guys.
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It has disappeared.
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It has evaporated.
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okay well that happens when we heat a solid then a liquid and then um and then that's it
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and it turns into a gas okay let's continue okay oh no we don't want to see myself again
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okay that's the change of state so let's see what we saw in the video okay we said that
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the hot object gives heat to the cold object so let's see you have a solid okay you heat it
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and it turns into a liquid you heat it and it turns into into a gas okay guys what does the
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second heat effect the first one was temperature variation where the temperature of the two objects
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change. Change is a state. And let's see the third one. Expansion and contraction. Let's
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try to understand this, okay? This happens in some objects. Expansion means grow. Watch
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this growth means it gets bigger okay and contraction means the opposite it gets smaller
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okay maybe you have seen this on some roads maybe you should look although don't walk on the road
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okay these roads okay on the side they have the road and then in the middle they have it's made
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out of metal and it's not very close to each other it's separated okay we're going to see why
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what happens is that in summer when it gets very very hot this metal the the material of the road
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expands it gets bigger and if they don't put these cracks okay that's a crack if they don't put that
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crack with that space imagine they get bigger bigger bigger and they end up breaking okay
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that's why they put this separated so if it expands it just gets closer and
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that's it that's one example another example is this one it's the ring and
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it's a ring made out of metal and a ball made out of metal for this explanation
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I'm going to show you another video but this time I didn't do it
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So that's a ball made out of metal and a ring.
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And the man sticks the ball in the ring.
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Now he's going to heat the ball made out of metal and something is going to happen.
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What do you think is going to happen when we heat a metal?
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I just told you with the road.
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We can't see it very well, but we will see what happens.
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Takes a little bit. Now he's gonna stick the ball again into the ring. What do you
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think it'll happen?
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Whoops! It doesn't fit. It doesn't fit. But why? I told you before. When we heat a
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a metal okay it expands it gets bigger it grows so it doesn't fit again in the ring now he put
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it in cold water and it contracted and it fits again in the ring okay so guys this is heat
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effects okay now from heat remember you have to say that it's produced again when heat is transfer
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between objects that are at a different temperature.
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That's one thing about a thermal effect. The important thing
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is that heat goes from the hottest object,
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from the object with the highest temperature, to the object
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that has the lowest temperature, or to the coldest temperature. It goes in that
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direction.
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Okay?
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What other thing? Oh yeah, and then the three heat effects.
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Temperature variation, the chair and the person, okay?
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Changes of state from solid to liquid, from liquid to gas, and expansion and contraction.
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Now, it's your turn to write it in your booklet, okay?
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Now, how are you going to do it?
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You have two pages.
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On one page, you're going to put when thermal is produced, thermal energy, sorry,
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and that characteristic that it goes from the hottest to the coldest object that on one page
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and on the other side the three heat effects you have your book use it if you need it and i will
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try to put some information on teens in case you have to do it if you don't have time here in the
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class to finish please do it at home okay and i'm going to be at home so at some point i will get
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teams. If you need any question, just ask, okay? But try to remember the information when you're
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reading your book, okay? Guys, I miss you a lot and I prefer being over there in the class with
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you, okay? Bye-bye, guys.
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- Subido por:
- Ainhoa G.
- Licencia:
- Reconocimiento
- Visualizaciones:
- 5
- Fecha:
- 17 de febrero de 2024 - 17:54
- Visibilidad:
- Clave
- Centro:
- CPR INF-PRI-SEC GREDOS SAN DIEGO ALCALÁ DE HENARES
- Duración:
- 17′ 40″
- Relación de aspecto:
- 1.78:1
- Resolución:
- 1280x720 píxeles
- Tamaño:
- 821.68 MBytes
