Properties of Materials · SHS2 Manufacturing…

Lesson notes

Learning Objectives

Indicator: 2.1.2.LI.2 - Outline the effect of loading, stress and strain on materials.

By the end of the lesson, learners can:

Describe the visible and internal effects of tensile, compressive and shear loading on a material.
Distinguish between elastic deformation and plastic deformation using the stress-strain behaviour of a material.
Predict the effect of exceeding a material’s elastic limit on its ability to return to its original shape.
Outline how applied stress relates to resulting strain for a given material type.
Justify the choice of a material for a given load-bearing application based on how it responds to loading.

Sign in with your phone number to read the full note and download the GES plan - free.

Sign in with phone number

Curriculum details

Strand: Manufacturing Materials and Technologies (Strand 1)
Sub-strand: Properties of Materials (1.2)
Content standard: 2.1.2.CS.1 - Demonstrate knowledge and understanding of loading, stress and strain of materials. 2.1.2.LO.1 Explain and measure the tensile properties of materials.
Indicator: 2.1.2.LI.2 - Outline the effect of loading, stress and strain on materials.
Suggested placement: Semester 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: NaCCA curriculum document, p. 57

Exemplars (from the NaCCA curriculum)

Experiential Learning: Learners measure the strain of materials in the laboratory using the strain gauge and determine the stress of the materials according to the applied strain. Display lab work for others to critique.
Project-Based Learning: Put learners into mixed-ability groups and let them use the strain gauge to measure the strain and calculate the stress induced in a mild steel using the modulus of elasticity of mild steel as available in textbooks. Learners share their findings with the class and receive feedback.
Teaching and Learning Materials:
- * Textbooks * Laboratory
- * Strain gauge * Laboratory equipment for performing stress-strain tests
Assessment (2.1.2.AS.2). The document marks these depth-of-knowledge levels for this indicator: Level 3 Strategic reasoning; Level 4 Extended critical thinking and reasoning.