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

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

Homework Check pp

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

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

Definitions

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

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

WOOD vs. MODIFIED WOOD: WOODMODIFIED WOOD

Mechanical Properties

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

Oak Hardwood Floor

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

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

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

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

Wood Bending

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

Floor Joists

Factors Affecting the Mechanical Properties of Wood

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

Reasons Wood Is Commonly Used in the Manufacture of Technical Objects

EASILY WORKED & ASSEMBLED

LOW THERMAL CONDUCTIVITY

LOW ELECTRICAL CONDUCTOR

Principal Species of Wood Used in Quebec

Hardwood HARDWOOD

Maple

Yellow Birch

Oak

Softwood

Spruce

Pine

Cedar

Main Types of Modified Wood

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

Laminated Wood Is made by gluing small pieces of wood together

Plywood Is made by gluing together large sheets of wood

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

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

Advantages of Using Modified Wood

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

homework Pp

Locker Shelf Isometric Projection Build (in partners)