KNOWLEDGE FOCUS Topic Grade 7 (Terms 2–3)


Structures Purpose of structures: contain, protect, support, span


Natural and man-made structures Types of structures: shell, frame, solid


Strengthening structures: by folding, tubing and triangulation


Frame structures: roof trusses, towers, cranes


Task: cellphone tower (link: electronic communications)


Grade 8 (Term 1) Reinforcing: struts, ties


Pylons (Link: electrical systems, the national grid)


Stabilising: base size, base angles, centre of gravity, ground anchors


Strengthening structures: using folding, tubing, triangular webs and internal cross- bracing


Components of frame structures: arch, beam, cantilever, column


Task: frame structure using mechanisms


Task: identify and solve problems related to community on the far side of a river


Grade 9 (Term 1)


Strength of materials under the action of forces: compression, tension, torsion, and shear


Properties of construction materials: mass, density, hardness, stiffness, flexibility, corrosion


Suitability of materials (fitness-for- purpose): in terms of properties, safety and cost effectiveness


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