Dynamics · SHS2 Physics

Lesson notes

Learning Objectives

Indicator: 2.1.4.LI.2 - Determine the coefficient of friction.

By the end of the lesson, learners can:

Define the coefficient of friction as the ratio of the frictional force to the normal reaction between two surfaces.
Use a spring balance and wooden blocks of different masses to measure the limiting frictional force and normal reaction.
Calculate the coefficient of friction for different surfaces and masses using the formula μ = F/N.
Compare coefficients of friction for different surface combinations and explain which pair offers more or less grip.
Apply the concept of coefficient of friction to predict whether an object will slide or remain at rest on a given surface.

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Curriculum details

Strand: Mechanics and Matter (Strand 1)
Sub-strand: Dynamics (1.4)
Content standard: 2.1.4.CS.1 - Demonstrate knowledge and understanding of friction. 2.1.4.LO.1 Explain how friction affects our daily life.
Indicator: 2.1.4.LI.2 - Determine the coefficient of friction.
Suggested placement: Semester 1, Week 12 (Week 12 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. 105

Exemplars (from the NaCCA curriculum)

Project - based learning: Let learners perform simple experiment to determine the coefficient of friction using wooden blocks of different masses attached with hooks and a spring balance.
Provide equitable access to physics resources, equipment, technology, and opportunities for hands-on experiments or projects, ensuring all learners have equal access to Learning resources and experiences.
Assessment (2.1.4.AS.2). The document marks these depth-of-knowledge levels for this indicator: Level 3 Strategic reasoning.
Teaching and Learning Resources:
- Spring balance
- Blocks of wood
- Electronic
- Wooden/plastic/metallic designing horizontal balance * Powder boards for * oil/grease inclined planes and planes,