SHS3 Design And Communication Technology · Semester 1 Week 13: Plane Geometry

Lesson notes

Learning Objectives

Indicator: 3.2.1.LI.4 - Explain the principles of forces acting on beams and trusses.

By the end of the lesson, learners can:

Identify and define the three main types of forces (tension, compression, and shear) that act on beams and trusses.
Explain the difference between a beam and a truss in terms of how each carries loads.
Describe the roles of supports (simple, fixed, and roller) in resisting forces on beams.
Draw a simple labelled diagram showing how compression and tension distribute through a loaded beam.
Work in groups to discuss and present explanations of how forces act on a truss bridge, using correct technical vocabulary.

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Curriculum details

Strand: Geometry (Strand 2)
Sub-strand: Plane Geometry (2.1)
Content standard: 3.2.1.CS.1 - 3.2.1.CS.1 Apply the concept of plane geometry in applied technology. 3.2.1.LO.1 Use the concepts of plane geometry to construct complex plane geometrical shapes and design different complex artefact based on plane geometrical figures
Indicator: 3.2.1.LI.4 - Explain the principles of forces acting on beams and trusses.
Suggested placement: Semester 1, Week 13 (Week 13 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: NaCCA curriculum document, p. 91

Exemplars (from the NaCCA curriculum)

Managing talk for learning: Use charts, board illustrations, the internet and pictures to assist learners understand forces through group discussion. Then engage learners in a whole class discussion to explain the principles of forces acting on beams and trusses.

Assessment (3.2.1.AS.4). The document marks these depth-of-knowledge levels for this indicator: Level 2 Skills of conceptual understanding.

Teaching and Learning Materials:
- Models
- Charts
- reference books
- drawing studio
- access to internet
- LCD Projector, sketches
- Pencils
- Erasers
- Pencil sharpener
- Sketch pads
- Drawing pens or ink
- Blending stumps
- Charcoal