1. Ch. 12 1.3-4 students per table 2.Workbook & Textbook 3.Pencil / Pen 4.Start when quiet

2. Homework Check pp. 195-198

3. Ch. 12 1.Wood 2.Modified Wood 3.Metals & Alloys 4.Plastics

4. Text / Work Books Text Book – p. 373 Work Book - p. 199 Copy the following definitions

5. Definitions

6. WOOD Is a material that comes from cutting and processing trees (p. 373)

7. MODIFIED WOOD Is treated wood or a material made with wood mixed with other substances

8. WOOD vs. MODIFIED WOOD: WOODMODIFIED WOOD

9. Mechanical Properties

10. Hardness Hardwood is harder than softwood Healthier trees have a higher level of hardness

11. Oak Hardwood Floor

12. Elasticity Wood usually has good elasticity It can suffer many impacts without becoming permanently deformed

14. Resilience When wood has adequate moisture content it is resilient and resistant to breakage When wood is dry it breaks easily

16. Ductility Wood has very little to no ductility It can not be stretched

18. Malleability Heat increases the malleability of wood. A plank or piece of wood can be bent if it is heated to a certain amount

19. Wood Bending

20. Tensile Strength Wood has excellent tensile strength so it is often used to support heavy loads. Hardwood has more tensile strength than softwood.

21. Floor Joists

22. Factors Affecting the Mechanical Properties of Wood

23. Factors affecting the mechanical… Species of tree Growth rate of tree Moisture content of tree Injuries sustained by tree (fungi, insects, etc)

24. Reasons Wood Is Commonly Used in the Manufacture of Technical Objects

25. EASILY WORKED & ASSEMBLED

26. LOW THERMAL CONDUCTIVITY

27. LOW ELECTRICAL CONDUCTOR

28. Principal Species of Wood Used in Quebec

29. Hardwood HARDWOOD

30. Maple

31. Yellow Birch

32. Oak

33. Softwood

34. Spruce

35. Pine

36. Cedar

37. Main Types of Modified Wood

38. Treated Wood Made by heating wood to high temperatures or by dipping it into a copper-based chemical product

40. Laminated Wood Is made by gluing small pieces of wood together

42. Plywood Is made by gluing together large sheets of wood

44. Particle Board Is made with wood chips and wood waste Particles are bonded with various products

46. Fiberboard (MDF) Is made by first separating wood fibers (very fine sawdust) Fibers are bonded with various products

48. Advantages of Using Modified Wood

49. Advantages Stable mechanical properties Weather resistant Used to manufacture large materials Made from small trees Made with wood chips and wood waste

50. homework Pp. 201-202

51. Locker Shelf Isometric Projection Build (in partners)