Properties of Materials · SHS2 Manufacturing…

Lesson notes

Learning Objectives

Indicator: 2.1.2.LI.1 - Explain elongation, elastic limit, modulus of elasticity, yield strength and tensile strength of materials.

By the end of the lesson, learners can:

Define elongation, elastic limit, modulus of elasticity, yield strength and tensile strength in their own words.
Distinguish between elastic deformation and plastic deformation using the stress-strain curve.
Explain the significance of each tensile property in selecting materials for manufacturing.
Identify the elastic limit, yield point and fracture point on a labelled stress-strain diagram.
Collaborate in pairs to research and present the meaning of at least two tensile properties to the whole class.

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Curriculum details

Strand: Manufacturing Materials and Technologies (Strand 1)
Sub-strand: Properties of Materials (1.2)
Content standard: 2.1.2.CS.2 - Demonstrate understanding on the tensile properties of materials. 2.1.2.LO.1 Explain and measure the tensile properties of materials.
Indicator: 2.1.2.LI.1 - Explain elongation, elastic limit, modulus of elasticity, yield strength and tensile strength of materials.
Suggested placement: Semester 1, Week 11 (Week 11 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.
Source document note: The official curriculum document has a fault in this entry, so the curriculum text above is transcribed exactly as printed:

content standard text - p.58: the content-standard token is visibly printed `1.1.2.CS.2` under Year 2 sub-strand 2.1.2 beside indicators 2.1.2.LI.1 and 2.1.2.LI.2; `2.1.2.CS.2` is used as the import code to preserve that printed table association
Curriculum reference: NaCCA curriculum document, p. 58

Exemplars (from the NaCCA curriculum)

Talk for Learning: In a question-and-answer session Learners discuss elongation, elastic limit, yield strength and tensile strength. Let different pairs look for the meaning and share with whole class. Use webbing to organize learners contribution.
Teaching and Learning Materials:
- Textbooks
- Videos
- Mild steel Laboratory equipment for performing tensile tests
Assessment (2.1.2.AS.1). The document marks these depth-of-knowledge levels for this indicator: Level 1 Recall; Level 3 Strategic reasoning.