Materials, their properties and everyday objects
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Hello everyone! Today we're going to study materials, okay, as the week before, but
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this time we're gonna look at their properties and everyday objects made
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with those materials. I am going to say bye-bye here, I'm gonna keep on talking, I
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I just minimize this so you can see everything, okay. So, do you know where do
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materials come from? Okay, for example, the sheep wool comes from sheep, okay, wool
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We use it to make clothing. Now what is this? Cotton. Cotton is actually a plant.
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We use cotton to make clothing or for cosmetics. Now this is a tree and a tree
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has wood. Do you know what do we use wood for? We'll see it in a moment. Metal, metal
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we will see. What do we use metal for? Sand and another tree with in the white
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substance. What can that be? Let's see. Let's start with wood. Wood is a natural
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material that comes from trees. Okay. It is hard and it's strong. It is used to
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make doors, pencils, furniture, and paper. Okay? The paper we use every day. It comes
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from a substance that wood has called cellulose. Okay? With cellulose we
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make paper and toilet paper as well so it's very important to recycle so we
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don't cut down many trees to make paper always recycle metal metal is a
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manufacturing material that comes from certain rocks. Okay? Metal is hard. It is strong and
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it is shiny. Okay? It is used to make cars, jewelry like bracelets or watches or earrings,
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cutlery forks knives spoons and to make planes okay the airplane it is also used to make paper
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and cardboard no this is a mistake it belongs to wood okay sorry for that fabric okay fabric
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Fabric is a generic term to call telas, okay?
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Tela can be made with wool or cotton or a mixture of both or even petroleum, okay?
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Fabric is soft, flexible and smooth.
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It is used to make clothing like your t-shirt or your trousers.
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Okay, it's used to make pillows and carpets.
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Yes, carpets.
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A carpet is a piece of fabric that you lay on the floor so the floor is not cold.
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Carpet means alfombra and not carpeta, which is folder.
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Glass. Glass is a manufactured material. Glass is made with very, very fine sand.
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It's a very specific sand. It's even finer than the sand you find in the beaches, okay?
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This sand is heated up at a very, very, very high temperature and actually becomes a liquid, okay?
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that liquid becomes cold and you can make glasses, okay, drinking glasses,
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windows and spectacles, which is a fancy word for glasses, okay? These glasses, the
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glasses we use to see people with. Okay? Very good. Plastic. Plastic is made of
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petroleum. Okay? That black oil we saw before. Plastic is all around us. Many
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things that we use every day are made of plastic and using plastic is not very
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good for the environment because it takes years and years and years to
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disappear that's why it's very important to recycle okay not use petroleum to
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make plastic but use plastic to make more plastic all right there are many types of plastic
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and depending on the object the plastic will be rigid or bendy for example rigid plastic
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Plastic is the plastic you find in your TV remote controller, ¿ok?
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El mando de la tele está hecho de plástico rígido.
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Or, plastic can be bendy.
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For example, the plastic we use to cover food.
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El film transparente que se utiliza para cubrir la comida no es rígido, ¿vale?
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Es manejable, se dobla, es flexible, ¿de acuerdo?
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A very important thing about plastic is that it is waterproof.
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roof. That means that water cannot pass through it. Okay? Very important. It is used to make
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bottles, toys, like Lego bricks, markers, pens and rulers. Okay? Rubber. It's a manufactured
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material. Rubber comes from tree sap, okay? It can come from tree sap,
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es decir, el árbol del caucho, okay? But then with chemical products it is transformed
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to make more rubber products like latex or nitrilo or goma, all right? The generic
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term for rubber is goma. And there are many types of rubber, okay?
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Tires are made of rubber. Los neumáticos de los coches están hechos de goma.
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La goma de borrar está hecha de goma. Las gomas elásticas están hechas de goma.
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Y los tan necesarios guantes están hechos de goma también.
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Okay? To make tires, erasers, elastic bands, boots and gloves.
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Clay. Clay is a natural material.
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Clay comes from the ground, like rocks, okay? And sand.
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It is soft and flexible when it is fresh, okay?
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clay, but becomes hard and rigid and waterproof when heated up in an oven.
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Clay is used to make bowls, pots, plates and other decorative objects.
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It is also used in construction, like bricks and tiles.
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Los ladrillos para hacer las casas y las tejas de los tejados are made up of clay.
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Finally, you'll be surprised to know that it's used to make cosmetics.
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because it has lots of cleaning properties.
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La arcilla tiene una capacidad depurativa en la piel muy, muy, muy importante.
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Pero no la arcilla que utilizamos para hacer un bol o hacer un ladrillo.
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arcilla específica, ¿vale? Eso ya lo aprenderemos en quinto o en sexto.
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Okay, now, why an object is made from...
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What do we mean by this?
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We mean that objects are made of certain materials and not others
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because of the properties the materials have.
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That is, a window is made of glass because it is clear, it is transparent, so it lets light pass through it.
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And it's waterproof, so rain doesn't get in.
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Okay, so you see, glass is hard, it's rigid, it's waterproof and clear, and that's why we use it to make windows or glasses, seen glasses.
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Okay, another object, boots.
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Boots are made of rubber because rubber is waterproof, so you can jump into muddy puddles, okay?
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If you're not wearing your rubber boots, you cannot jump in water puddles, okay?
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So, depending on what we need, we will use one material or another.
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Are you going to make an umbrella out of fabric?
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No, because fabric is not waterproof.
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waterproof, ok? No vamos a hacer un paraguas de tela porque si no, ¿qué va a pasar? Que
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la tela no aísla del agua, con lo cual nos vamos a calar, ¿vale? Ya veremos que hay
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telas que se pueden plastificar o materiales que se pueden tejer junto con la tela para
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que sea waterproof. Challenge time! Now it's your turn to go into your pupil's
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book, digital or paper, and do pages 70, 71 and 72. Okay, they are very easy if you
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understood this video, okay? I'll see you next time. Bye-bye!
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- Subido por:
- Ana R.
- Licencia:
- Reconocimiento - No comercial - Sin obra derivada
- Visualizaciones:
- 113
- Fecha:
- 4 de mayo de 2020 - 23:24
- Visibilidad:
- Clave
- Centro:
- CP INF-PRI ROSA LUXEMBURGO
- Duración:
- 14′ 32″
- Relación de aspecto:
- 1.78:1
- Resolución:
- 1920x1080 píxeles
- Tamaño:
- 15.96 MBytes
