Lesson Notes By Weeks and Term v4 - JHS 3
RESISTANT MATERIALS
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RESISTANT MATERIALS
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Subject: Career Technology
Class: JHS 3
Term: 1st Term
Week: 12
Grade code: B9.2.2.1.1
Strand code: 2
Sub-strand code: 2
Content standard code: B8.5.3.1
Indicator code: B9.2.2.1.1
Theme: MATERIALS FOR PRODUCTION
Subtheme: RESISTANT MATERIALS
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In our communities, we see skilled artisans like carpenters, welders, and masons creating useful products every day. Have you ever noticed that a carpenter uses a different saw from a welder? Or that a mason wears thick gloves when mixing concrete? This is not by accident. Working with strong materials like wood, metal, and plastic (resistant materials) requires special knowledge. Using the wrong tool can damage the material, destroy the tool, and most importantly, cause serious injury. This lesson explores *why* we must use specific tools and follow strict safety rules for each type of resistant material. Mastering this will make you a safer, more efficient, and more skilled creator.
What are Resistant Materials? First, let's remember what resistant materials are. They are materials that can resist forces like scratching, bending, and breaking. The main types we work with in Career Technology are: Wood: From trees like Odum, Wawa, and Mahogany. It has a grain (fibres running in one direction). Metal: Like mild steel, aluminium, and copper. They are dense, hard, and do not have a grain. Plastics: Like acrylic (Perspex) and PVC. Some are flexible, others are hard and brittle.
The key idea for today is that the properties of each material determine the tools, techniques, and safety rules we must use. Part 1: Why Specific Tools for Specific Materials?
The main reason is the difference in material properties, especially Hardness and Structure. Hardness: This is a material's ability to resist being scratched or dented. A tool can only cut a material if the tool itself is harder than the material. Structure: This refers to how the material is made up inside. Wood has a fibrous grain, while metal has a crystalline structure.
Let's look at some examples: