Section B
Planning and assessment Teaching plan for Technology Grade 8
This table shows the pacing of the topics for the course by term, where to find the content and activities in the Learner’s Book, and when formal assessment takes place.
TERM 1 Unit 1
Frame structures • Definition of frame structures.
– Purpose of structural members (components) in wood and steel roof trusses (King and Queen post, strut, tie, rafter, tie beam).
– Learners identify structural members and type of force (shear, torsion, tension, compression) acting on them in given frame structures.
• Case study: Electrical pylons – use pictures of a range of pylon designs noting: – The variety of designs that solve the same problem effectively. – The use of internal cross-bracing and triangulation to provide stiffness. • Structural members under tension/compression (worksheet).
2
Structural members • Structures that span over space:
– Beams: steel I-beams (girders), concrete lintels; beam and column bridge. – Alternative bridge supports: suspension bridges; cable-stayed bridges. – Arches: arches in buildings, bridges, dam walls. – Cantilevers: simple cantilever, cable-stayed cantilever.
3
• Structural failure – the three most likely ways structures fail are: – Fracture of a member – due to lack of strength. – Bending (flexing, buckling) – due to lack of stiffness (rigidity). – Toppling over – due to lack of stability (top heavy, narrow base).
15 29–35 21–28 2 Topic 1: Structures
Learner’s Book page
10–20 Time
allocation (2 hours)
2
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