3.2.2

Timber

Test yourself on Timber

Test your knowledge with free interactive questions on Seneca — used by over 10 million students.

Torsion and Shear Force

Materials can be manipulated to resist and work with forces and stresses.

Torsion with woods

Torsion with woods

  • Wood has very good torsional strength but there are often issues with ensuring that the wood does not warp under moisture and differing conditions.
  • Some scaffolding boards have metal brackets that hold and prevent the wood timber from warping and increasing its torsional strength.
  • It goes without saying that torsional strength is key when being used for scaffolding
Hardwoods and softwoods

Hardwoods and softwoods

  • Hardwood materials that are dense and have close grains that make them less likely to warp compared to softwoods.
  • However, softwoods are used with metal brackets as they are more sustainable and they are more economical.
Shear force with woods

Shear force with woods

  • Wood, especially close grain hardwoods, resist shear force.
  • Some softwoods are weaker but generally speaking, can withstand shear forces just as well.
Affecting shear force

Affecting shear force

  • Knots and looser grains reduce the strength of wood which directly affects its ability to resist shear force.
  • If moisture is increased you will weaken the ability for the timber to withstand shear forces.
  • If plywood is not glued and laminated properly, its ability to withstand sheer force will be reduced greatly.

Tension, Compression and Bending

Materials can be manipulated to resist and work with forces and stresses.

Tension

Tension

  • The tensile strength of wood is very high due to its grain and structure.
  • Moisture, over time, can affect the tensile strength.
  • Wood is a good choice for when tensile strength is needed, but wood is 30% stronger in compression than tension.
Compression

Compression

  • Wood is excellent for compression.
  • Moisture content can severely affect its ability to withstand compression which results in an ineffective piece of timber/wood.
  • Wood, when working in the direction of the grain, can withstand compression well. However, if pushed too far, hardwood will fail.
Bending

Bending

  • Bending, as a force, can be desirable in certain situations.
  • Often Aeroply is used (as it is a thin laminated sheet) with water and heat. Bending can be used to show off how curves can be used with wood.
Kerfing

Kerfing

  • Bending can also be achieved through kerfing.
  • Kerfing is creating half slots through the use of a saw. Glue is applied once the wood is bent.
Jump to other topics
1

Core Technical Principles

1.1

New & Emerging Technologies

1.1.1Industry1.1.2Enterprise1.1.3Sustainability1.1.4People1.1.5Culture & Society1.1.6Environment1.1.7Production Techniques & Systems1.1.8Emerging Technologies & Design1.1.9End of Topic Test - New & Emerging Technologies1.1.10Exam-Style Questions - Emerging Technologies
1.2

Energy Generation & Storage

1.2.1Fossil Fuels & Nuclear1.2.2Renewable Energy1.2.3Energy Storage Systems
1.3

Developments in New Materials

1.3.1Modern Materials1.3.2Smart Materials1.3.3Exam-Style Questions - Smart Materials1.3.4Composite Materials1.3.5Technical Textiles
1.4

Systems Approach to Designing

1.4.1Inputs1.4.2Processes1.4.3Outputs1.4.4Looped Systems
1.5

Mechanical Devices

1.5.1Types of Movement1.5.2Levers1.5.3Linkages1.5.4Rotary Systems1.5.5End of Topic Test - Designing & Mechanical Devices
1.6

Materials Categories

1.6.1Timbers1.6.2Metals & Alloys1.6.3Metals & Alloys 21.6.4Polymers1.6.5Polymer Types1.6.6Textiles1.6.7Textile Types: Fibres1.6.8Textile Types: Weave1.6.9Paper & Boards
1.7

Material Properties

1.7.1Physical & Working Properties1.7.2End of Topic Test - Materials1.7.3Exam-Style Questions - Materials
2

Paper & Board: Specialist Technical Principles

2.1

Selection of Materials

2.1.1Paper & Boards2.1.2Working with Paper & Boards
2.2

Paper & Board: Forces & Stresses

2.2.1Paper & Board: Forces & Stresses2.2.2Cardboard & Paper
2.3

Paper & Board: Ecological & Social Footprint

2.3.1Paper & Board: Ecological & Social Footprint2.3.2Paper & Board: The Six Rs2.3.3Social Issues
2.4

Paper & Board: Sources & Origins

2.4.1Paper & Board2.4.2End of Topic Test - Paper & Board
2.5

Paper & Board: Using Materials

2.5.1Paper & Board: Properties of Materials2.5.2Paper & Board: Modification of Materials2.5.3Paper & Board: Shape & Form
2.6

Paper & Board: Stock Forms, Types & Sizes

2.6.1Paper & Board: Forms2.6.2Paper & Board: Types2.6.3Paper & Board: Sizes2.6.4Paper & Board: Standards Components
2.7

Paper & Board: Scales of Production

2.7.1Paper & Board: Scales of Production2.7.2Exam-Style Questions - Scales of Production
2.8

Paper & Board: Specialist Techniques & Processes

2.8.1Paper & Board: Techniques & Processes2.8.2Paper & Board: Quality Control
2.9

Paper & Board: Surface Treatments & Finishes

2.9.1Paper & Board: Surface Treatments & Finishes2.9.2End of Topic Test - Specialist Techniques
3

Timber: Specialist Technical Principles

3.1

Timber: Selection of Materials

3.1.1Timber Based Materials3.1.2Timber: Environment & Ethics
3.2

Timber: Forces & Stresses

3.2.1Timber: Forces & Stresses3.2.2Timber
3.3

Timber: Ecological & Social Footprint

3.3.1Timber: Ecological & Social Footprint3.3.2Timber: The Six Rs3.3.3Timber: Social Issues3.3.4Exam-Style Questions - Timber
3.4

Timber: Sources & Origins

3.4.1Timber3.4.2Timber: Processing & Seasoning3.4.3Manufactured Board3.4.4End of Topic Test - Timber
3.5

Timber: Using Materials

3.5.1Timber: Properties of Materials3.5.2Timber: Modification of Materials3.5.3Timber: Shape & Form3.5.4Timber: Shape & Form 2
3.6

Timber: Stock Forms, Types & Sizes

3.6.1Timber: Stock Forms, Types & Sizes
3.7

Timber: Scales of Production

3.7.1Timber: Scales of Production
3.8

Timber: Specialist Techniques & Processes

3.8.1Timber: Tools, Equipment & Processes3.8.2Timber: Tools, Equipment & Processes 23.8.3Timber: Quality Control
3.9

Timber: Surface Treatments & Finishes

3.9.1Timber: Surface Treatments3.9.2Timber: Finishes3.9.3End of Topic Test - Specialist Techniques
4

Metal: Specialist Technical Principles

4.1

Metals: Selection of Materials

4.1.1Metal-Based Materials4.1.2Ferrous Metals4.1.3Non-Ferrous Metals4.1.4Alloys4.1.5Metals: Environment & Ethics
4.2

Metals: Forces & Stresses

4.2.1Metals: Forces & Stresses
4.3

Metals: Ecological & Social Footprint

4.3.1Metals: Ecological Footprint4.3.2Metals: Social Footprint4.3.3Metals: The Six R's4.3.4Metals: Social Issues
4.4

Metals: Sources & Origins

4.4.1Origins of Metal4.4.2Processing Metals
4.5

Metals: Alloy-Based Materials

4.5.1Types of Metal Alloys4.5.2Alloying Elements4.5.3Properties & Benefits4.5.4Processing & Fabrication4.5.5Applications of Alloys4.5.6Metal Alloys in Industry4.5.7Applications of Metal Alloys
4.6

Metals: Using Materials

4.6.1Properties of Metals4.6.2Modification of Metals4.6.3Metals: Shape & Form
4.7

Metals: Scales of Production

4.7.1Metals: Scales of Production
4.8

Metals: Specialist Techniques & Processes

4.8.1Metals: Tools4.8.2Metals: Tools & Equipment4.8.3Metals: Cutting, Forming & Machining Processes4.8.4Metals: Joining, Casting & Heat Treatment Process
4.9

Metals: Quality Control

4.9.1Metals: Quality Control4.9.2Metals: Quality Control Processes
4.10

Metals: Surface Treatments & Finishes

4.10.1Metals: Surface Treatments4.10.2Metals: Surface Treatments for Metals4.10.3Metals: Finishes4.10.4Metals: Finishing Techniques for Metals
5

Polymers: Specialist Technical Principles

5.1

Polymers

5.1.1Polymers: Functionality & Aesthetics5.1.2Polymers: Environment & Ethics5.1.3Polymers: Sources, Origins & Properties5.1.4Polymers: Forces & Stresses5.1.5Polymers: Ecological & Social Footprint5.1.6Polymers: The Six R's
5.2

Polymer Categories

5.2.1Categories of Polymers5.2.2Thermoforming Polymers5.2.3Thermosetting Polymers
5.3

Polymer Forms

5.3.1Polymers: Stock Forms5.3.2Polymers: Shape & Form
5.4

Polymer Production, Techniques & Quality Control

5.4.1Polymers: Scales of Production5.4.2Polymers: Specialist Techniques & Processes5.4.3Polymers: Quality Control Systems: Tolerance5.4.4Polymers: Finishes
6

Textiles: Specialist Technical Principles

6.1

Textile Materials

6.1.1Origin of Textiles6.1.2Textile Industry
6.2

Selection of Materials

6.2.1Natural Fibres6.2.2Synthetic Fibres6.2.3Environmental Concerns6.2.4Environmental Impact6.2.5Ethical Challenges
6.3

Forces & Stresses

6.3.1Forces & Stresses
6.4

Ecological & Social Footprint

6.4.1Ecological Footprint6.4.2Social Footprint6.4.3Addressing Ecological & Social Footprints6.4.4The Six R's6.4.5Labour Conditions6.4.6Social Issues6.4.7Addressing Social Issues
7

Designing & Making Principles

7.1

Investigation & Data

7.1.1Iterative Design7.1.2Primary & Secondary Data7.1.3Market Research7.1.4Ergonomics7.1.5Specifications7.1.6End of Topic Test - Investigation & Data7.1.7Exam-Style Questions - Specifications
7.2

Environmental, Social & Economic Challenges

7.2.1Challenges7.2.2Your Research
7.3

The Work of Others

7.3.1Designers7.3.2Architects7.3.3Product Design7.3.4Industrial Designers7.3.5Product Design Companies7.3.6Textile Design Companies7.3.7End of Topic Test - The Work of Others
7.4

Design Strategies

7.4.1Design Strategies
7.5

Communication of Design Ideas

7.5.1Design Communication
7.6

Prototype Development

7.6.1Prototype Development
7.7

Selection of Materials

7.7.1Materials
7.8

Tolerances

7.8.1Tolerances
7.9

Material Management

7.9.1Managing Material7.9.2Tools
7.10

Specialist Equipment

7.10.1Health & Safety
7.11

Specialist Techniques & Processes

7.11.1Specialist Techniques & Processes7.11.2Surface Finishes7.11.3End of Topic Test - Designing & Making

Practice questions on Timber

Can you answer these? Test yourself with free interactive practice on Seneca — used by over 10 million students.

  1. 1
    The purpose of metal brackets on scaffolding: Fill in the list
  2. 2
    Factors that affect timber's ability to resist shear force:Fill in the list
  3. 3
    Why is the tensile strength of wood very high?Fill in the list
  4. 4
    Moisture can affect wood's:Fill in the list
Answer all questions on Timber

Unlock your full potential with Seneca Premium

  • Unlimited access to 10,000+ open-ended exam questions

  • Mini-mock exams based on your study history

  • Unlock 800+ premium courses & e-books

Get started with Seneca Premium

Timber: Forces & Stresses

Timber: Ecological & Social Footprint