This document discusses natural and manufactured materials. It begins by explaining that natural materials like plants, animals, and rocks are found in nature, while manufactured materials are new materials created by humans using natural materials. Some examples given are cotton and plastic. It then lists properties of materials such as being transparent/opaque, rough/smooth, hard/soft, flexible/rigid, and absorbent/waterproof. Videos are provided as examples of natural materials being transformed into manufactured materials, such as from natural rubber to rubber boots or bands.

1. Materials. (part II)

2. INDEX:
• Natural materials and manufactued materials. pg 3
• Properties of materials pg 12
- transparent/opaque
- rough/smooth
- hard/soft
- flexible/rigid
- absorbent/waterproof

3. In this lesson we will learn the difference between:
natural materials and manufactured materials.

4. Natural materials are found in nature.
They can be plants…
Cotton Wood Cocoa

5. animals, ...
Sheep
Silkworms
Horse
Alpaca

6. and rocks.
Diamond
Iron
Copper
Gold
Silver
Sand

7. 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

8. NATURAL MATERIALS MANUFACTURED MATERIALS
horsehair
violin bow

9. NATURAL MATERIALS MANUFACTURED MATERIALS
iron
cocoa

10. NATURAL MATERIALS MANUFACTURED MATERIALS
gold

11. Now, enjoy the next videos.

12. From mud to a clay pot.

13. From natural rubber...
… to boots
… to rubberbands

14. From horsehair…
…to a violin bow

15. Properties of materials.

16. Part one.

17. Look through different materials.
What do you see?

18. Some materials are transparent.
You can see clearly through them.
Can you name any transparent materials?

19. Glass is transparent.

20. Why is it important for these objects
to be transparent?

21. Other materials are opaque.
You cannot see through them.
Can you name some opaque materials?

22. Wood and metal are examples of opaque
materials.

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

24. Part 2.

25. What do you feel?

26. Materials can be rough or smooth.
Rough Smooth

27. Is your skin rough or smooth?
My skin is…

28. Fold a piece of paper in half. On one side write:
Rough. On the other side, write: Smooth.
Now rub a cryon on different surfaces.

29. Materials can be hard or soft.

30. hard soft.

31. Find three hard objects
and three soft objects.

32. Materials can be flexible or rigid.

33. Are rulers flexible or rigid?
Rulers can be…

34. Are trees flexible or rigid?

35. Is your body flexible or rigid?

36. Find three flexible things.
and three rigid things.

37. Remember…

38. Part three.

39. How does water affect different materials?

40. Some materials are absorbent.
mop
sponge
cotton
towels
Cleaning cloth
Towel paper

41. Absorbent materials can take in water
or another liquid.

42. Other materials are waterproof.

43. Waterproof materials do not let water
go through.

44. Is your coat absorbent or waterproof?

45. How about your shoes/boots?

46. Is paper absorbent or waterproof?

47. Is your folder waterproof?

48. Is your skin absorbent or waterproof?