NATURAL SCIENCE - UNIT: MATTER AND MATERIALS - PROPERTIES OF MATERIALS

NATURAL SCIENCE

UNIT - MATTER AND MATERIALS

LESSON: PROPERTIES OF MATERIALS

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Well, let's start doing our Unit's song:

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Before we learn new things let's remember what we have been learning on this unit so far:

- We have been learning about: GENERAL PROPERTIES OF MATERIALS: MASS and VOLUME.

 - And we have also been learning about: SPECIFIC PROPERTIES OF MATTER: HARDNESS, BRITTLENESS, ELASTICITY and DENSITY.

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Now, let's get back to your infant days 😉 to talk about materials... Do you remember the story of 'The three little pigs'? ... I'm sure you do 😊... I have a question for you... If we think about materials... What was the problem that the two first pigs had with their houses...?

Well yes! The problem was that they were not using the right materials to build them... That's why the wolf could destroy them... But their brother was building the right house using the right materials...

That happens with everything that we want to create... Houses, machines, structures... We need to know the PROPERTIES of the materials that we are using... So the final result is the right one, and we can use them to live, to protect ourselves, to cook...

That is what we will learn today on our lesson.

One of the properties we are going to learn about is Thermal Conductivity, that is the capacity of one object to conduct heat. This next video shows you what thermal conductivity is through one experiment:

Now watch this other video about materials that can absorb water...

... The opposite idea to absorbing water it's IMPERMEABILITY... Remember this word.

So... We have been talking about HEAT CONDUCTION and IMPERMEABILITY (which is opposite to absorption)... The third idea that we have to learn is TRANSPARENCY.

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Now... Can you think about some examples where these properties are important?... Well let me give you one... ARQUITECTURE... Yes! Creating houses and buildings... If we are in a place without light, we need to use transparent materials... If we are in a cold place we need to use materials that don't let heat get out of our house...

This is what you will find on your LESSON's SUMMARY (this summary has 2 parts):

Your homework:

You have to do your lesson's summary in your notebook and you have to study it... And you also have to study and review your previous summaries from this Unit. 

REMEMBER: After studying your summary you should explain it to somebody from your family, if they are very busy... Then you can pretend (imagine) that you are explaining it to your classmates... That will help you to understand it better!