SHS3 Manufacturing Engineering · Semester 1 Week 8: Properties of Materials

Lesson notes

Learning Objectives

Indicator: 3.1.2.LI.2 - Measure the tensile strength of bamboo material.

By the end of the lesson, learners can:

Define tensile strength and state its SI unit (pascals, Pa, or newtons per square metre, N/m²).
Describe the procedure for performing a tensile test on a bamboo sample using a tensile test machine.
Measure and calculate the tensile strength of a bamboo sample from load and cross-sectional area data.
Compare the measured tensile strength of bamboo with published values for steel and explain why bamboo is used in specific structural applications in Ghana.
Present experimental results to the class, interpret the outcome, and give constructive feedback to peers.

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Curriculum details

Strand: Manufacturing Materials and Technologies (Strand 1)
Sub-strand: Properties of Materials (1.2)
Content standard: 3.1.2.CS.1 - Demonstrate knowledge of mechanical properties of bamboo. 3.1.2.LO.1 Explain and measure the mechanical properties of bamboo and explain that materials can fail through creep, fatigue or fracture.
Indicator: 3.1.2.LI.2 - Measure the tensile strength of bamboo material.
Suggested placement: Semester 1, Week 8 (Week 8 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. 82

Exemplars (from the NaCCA curriculum)

Experiential Learning: Learners in mixed-ability groups perform a tensile test on a bamboo sample in the laboratory, compare the results with the tensile strength of steel, and present their results to the class for feedback.
Teaching and Learning Materials:
- Textbooks
- Library resource
- Internet access
- Tensile test machine
Assessment (3.1.2.AS.2). The document marks these depth-of-knowledge levels for this indicator: Level 1 Recall; Level 2 Skills of conceptual understanding; Level 3 Strategic reasoning.