Materials. (part II)

INDEX: • Natural materials and manufactued materials. pg 3• Properties of materials pg 12

- transparent/opaque- rough/smooth- hard/soft- flexible/rigid- absorbent/waterproof

In this lesson we will learn the difference between:

natural materials and manufactured materials.

Natural materials are found in nature.

They come from plants…Cotton Wood Cocoa

animals, ...Sheep

Silkworms

Horse

Alpaca

and rocks.Diamond

Iron

Copper

Gold

Silver

Sand

Humans use natural materials to make new materials. These new materials are called: manufactured materials.

Petroleum is a natural material A plastic ruler is a manufactured material

NATURAL MATERIALS MANUFACTURED MATERIALS

horsehair

violin bow

NATURAL MATERIALS MANUFACTURED MATERIALS

iron

cocoa

NATURAL MATERIALS MANUFACTURED MATERIALS

gold

Now, enjoy the next videos.

From mud to a clay pot.

From natural rubber...

… to boots

… to rubberbands

From horsehair…

…to a violin bow

Properties of materials.

Part one.

Look through different materials. What do you see?

Some materials are transparent. You can see clearly through them.

Can you name any transparent materials?

Glass is transparent.

Why is it important for these objects to be transparent?

Other materials are opaque. You cannot see through them.

Can you name some opaque materials?

Wood and metal are examples of opaque materials.

Think of the walls of your house/flat. Are they transparent or opaque? Why?

Part 2.

What do you feel?

Materials can be rough or smooth.

Ro

ugh

Smooth

Is your skin rough or smooth?My skin is…

Put a piece of paper on three different surfaces. Rub your cryon and observe the result.

Materials can be hard or soft.

hard soft.

Find three hard objects and three soft objects.

Materials can be flexible or rigid.

Are rulers flexible or rigid? Rulers can be…

Are trees flexible or rigid?

Is your body flexible or rigid?

Find three flexible things. and three rigid things.

Remember…

Part three.Get wet!

How does water affect different materials?

Some materials are absorbent.

mop

spongecotton

towels

Cleaning cloth

Towel paper

Absorbent materials can take in water

or another liquid.

Other materials are waterproof.

Waterproof materials do not let water

go through.

Is your coat absorbent or waterproof?

How about your shoes/boots?

Is paper absorbent or waterproof?

Is your folder waterproof?

Is your skin absorbent or waterproof?