Matter · SHS2 Physics

Lesson notes

Learning Objectives

Indicator: 2.1.2.LI.2 - State Hooke’s law.

By the end of the lesson, learners can:

Describe the relationship between load (force) and extension of an elastic material based on observations from a spring experiment.
State Hooke’s law in words and mathematically as F = k × e.
Identify the proportional limit and elastic limit from a force-extension graph.
Calculate the spring constant (k) from given force and extension values using Hooke’s law.
Interpret a force-extension graph to predict how a material will behave when increasing forces are applied.

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Curriculum details

Strand: Mechanics and Matter (Strand 1)
Sub-strand: Matter (1.2)
Content standard: 2.1.2.CS.1 - Demonstrate knowledge and understanding the behaviour of materials. 2.1.2.LO.1 Use the concept of elasticity to predict the behaviour of materials under the influence of stress and strain.
Indicator: 2.1.2.LI.2 - State Hooke's law.
Suggested placement: Semester 1, Week 5 (Week 5 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. 94

Exemplars (from the NaCCA curriculum)

Project - based learning:
- Guide learners to perform an experiment to demonstrate the relationship between load and extension using the spring.
- Guide learners to plot force-extension graph from a pair of points obtained their class activities. From the graph learners must state Hooke's law.
- Let learners identify and explain the following from the graph plotted above: elastic limit, yield point, proportional limit.
Task given to learners must take into account mathematical abilities of individual learners and explore contributions of vulnerable groups in the class.
Assessment (2.1.2.AS.2). The document marks these depth-of-knowledge levels for this indicator: Level 2 Skills of conceptual understanding.
Teaching and Learning Resources:
- Audio-visuals
- Internet
- Projectors
- YouTube
- Interactive virtual laboratory
- Retort stand
- Spring
- Loading pan
- Metre rule
- Pointer
- Masses