JHS1 Career Technology · Term 1 Week 10: Resistant Materials

Lesson notes

Learning Objectives

Indicator: B7.2.2.1.3 - Explain how each of the resistant materials is manufactured/produced

By the end of the lesson, learners can:

Explain at least two natural sources and two synthetic sources from which plastics are obtained.
Distinguish between thermoplastics and thermosetting plastics, giving at least two examples of each.
Describe, in the correct sequence, how a mature tree is processed into seasoned timber.
Explain the basic steps involved in obtaining metals from the earth, from mining to refined form.
Classify common building materials as either natural (sand, stones, clay) or man-made (cement, lime) and state where the natural ones are obtained.

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Curriculum details

Strand: Materials for Production (Strand 2)
Sub-strand: Resistant Materials (2.2)
Content standard: B7.2.2.1 - Demonstrate knowledge of basic concept of resistant materials
Indicator: B7.2.2.1.3 - Explain how each of the resistant materials is manufactured/produced
Suggested placement: Term 1, Week 10 (Week 10 of the year)
Our suggestion, laid out in curriculum order across three terms of twelve weeks. NaCCA does not fix the week, so follow your school's scheme of learning.
Curriculum reference: Career Technology, Common Core Programme (JHS1-JHS3), 2023, p. 11
Transcribed from the official NaCCA publication. Check this page against the source.

Exemplars (from the NaCCA curriculum)

1. Discuss the two main sources (natural and synthetic) from which plastics are obtained.
E.g.
- Natural resources: plants (cellulose), trees, animals, insects
- By-products: table tennis balls, acetate films, wrapping; rubber, roads, paint, decoration, glues, polish
- Synthetic sources: crude oil, coal and natural gas
- By-products: chemically produced plastics-polymerising vinyl chloride (PVC), polystyrene, polyethylene, acrylic.
2. Find out information from different sources including online, on the two types of plastics and give examples.
E.g.
- Thermoplastics: polythene, PVC, nylon
- Thermosetting plastics: urea formaldehyde, polyester resin, epoxy resin
3. Make a table and match products to the types of plastics they are made from,
E.g.
Material | Products
Polythene | toys, carrier bags, packaging film
Urea formaldehyde | textile, (white) electrical fittings, adhesives (wood)
4. Explain briefly how wood is obtained.
E.g., A mature living tree is felled, the branches are cut off to obtain the log, which is then converted (sawn) to standard sizes, then seasoned.
5. Distinguish between solid timber and man-made boards and give examples.
E.g., Solid timber is made from harvested trees or similar natural sources, whereas man-made boards are often produced from small pieces of wood or waste wood
6. Compare the weight of products made from solid timber and man-made boards
E.g. Solid timber products: heavier in weight, less flexible Man-made board products: lighter in weight, more flexible
7. Explain briefly how metals are obtained
E.g., The raw material is mined from the earth; it undergoes processes such as crushing, washing and grading; several other processes are carried out to get it in a refined form.
8. Identify products made from each category of metals
E.g.: Ferrous metals: machine parts, nails, hand tools Non-ferrous metals: kitchen cooking utensils, window frames, electrical wires Alloys: sculptures, statues, ornaments Smart: shape memory alloy (SMA)
9. Identify and classify materials used for building.
E.g.
- Natural: sand, stones, clay
- Man-made: cement, lime
10. Discuss the sources of the natural building materials.
E.g.
- Sand is obtained from pits, river banks, sea
- Stone is obtained from quarries