Timbers And Boards
Overview
Wood is one of the oldest engineering materials and still one of the most useful. It is a renewable, workable, surprisingly strong material that comes straight from a living tree, and the way a tree grows leaves clues in the wood - the grain, the rings, the knots - that a designer learns to read. The first and most important split is between softwoods from fast-growing evergreen trees and hardwoods from slower broadleaved trees, a classification based on the type of tree, not simply on how hard the wood feels.
This note covers the 0445 Materials-option timber objectives: classifying natural timbers, their stock forms, properties, environmental impact and uses; the named softwoods (cedar, pine, redwood, spruce) and hardwoods (oak, mahogany, meranti, jelutong); the family of manufactured boards including plywood, chipboard and MDF; and a clear-eyed comparison of when a manufactured board beats solid timber and when it does not.
Objectives
- demonstrate knowledge of natural timbers and understand their classification, stock forms, properties, environmental impact and uses
- demonstrate knowledge of softwood timbers, for example: - cedar - pine - redwood - spruce - local equivalents
- demonstrate knowledge of hardwood timbers, for example: - oak - mahogany - meranti - jelutong - local equivalents
- demonstrate knowledge of manufactured boards, for example: - plywood - chipboard - fibre-based boards including medium density fibreboard (MDF) - local equivalents
- understand the advantages and disadvantages of working with manufactured boards compared with natural timbers.
Lesson Note
Available on the Green Bridge App
Download the Green Bridge CBT app on your phone or computer to access full lesson notes, practice questions, and more.
Lesson Evaluation
Congratulations on completing the lesson on Timbers And Boards. Now that youve explored the key concepts and ideas, its time to put your knowledge to the test. This section offers a variety of practice questions designed to reinforce your understanding and help you gauge your grasp of the material.
You will encounter a mix of question types, including multiple-choice questions, short answer questions, and essay questions. Each question is thoughtfully crafted to assess different aspects of your knowledge and critical thinking skills.
Use this evaluation section as an opportunity to reinforce your understanding of the topic and to identify any areas where you may need additional study. Don't be discouraged by any challenges you encounter; instead, view them as opportunities for growth and improvement.
- Which feature defines a hardwood? A. The wood is always physically hard B. It comes from a deciduous broadleaved tree C. It is always darker than a softwood D. It cannot be used for furniture Answer: B
- Which softwood is naturally durable and most suitable for outdoor cladding without heavy treatment? A. Spruce B. Pine C. Cedar D. Jelutong Answer: C
- Why does plywood have an odd number of veneers? A. To make it cheaper B. So the grain of the outer veneers runs the same way and the panel stays balanced and flat C. To allow it to be bent into curves D. So it can be used outdoors Answer: B
- Which is a correct disadvantage of MDF compared with solid timber? A. It cannot be painted B. It is more expensive than oak C. It swells and is weakened if it gets wet, and its dust is a health hazard D. It is too strong to machine Answer: C
- Why are brass or stainless steel screws preferred to ordinary steel screws when working with oak? A. Oak is too soft for steel screws B. The tannin in oak corrodes steel and causes blue-black staining C. Steel screws are more expensive D. Oak cannot be drilled Answer: B
Available on the Green Bridge App
Download the Green Bridge CBT app on your phone or computer to access full lesson notes, practice questions, and more.
Available on the Green Bridge App
Download the Green Bridge CBT app on your phone or computer to access full lesson notes, practice questions, and more.
Recommended Books
Practice Mock Questions
Want to practice mock questions on Timbers And Boards? Download the Green Bridge CBT app to access mock questions and full practice assessments for this topic.
Download The App On Google Playstore
Everything you need to excel in JAMB, WAEC & NECO
