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Hello boys and girls! Today we are going to talk about changes in materials.

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We can change the shape of solid materials by applying some forces on

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them. Now we are going to see some of these forces. The first thing that we can

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do is to cut the materials. We can change their shape by cutting them.

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We can cut some things like, for example, paper or cardboard.

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As well, we can bend some materials and change their shape.

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We can bend some things like, for example, a cotton swab like this.

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Or like, for example, a book binder like this. You can bend it in the way that you want.

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Also, we can stretch some materials.

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We can stretch some things like, for example, a rubber band or like, for example, a hair band.

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One more thing that we can do to materials is to squeeze them.

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We can squeeze some objects as a pencil case or as a cushion.

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Two more things that we can do to some materials are hit them or cool them.

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We can hit them or cool them to change their shape.

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Let's see an example for a hit. Here we have some solid chocolate and if we hit it,

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we will have it in this liquid shape.

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Now let's see one example for cool. In this picture we can see water.

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What happens if we cool the water? Do you know?

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Right! It turns into ice. Very good!

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Okay boys and girls, I hope you liked this video. So, we will see soon. Bye bye!