Basic Physics · SHS2 Physics

Lesson notes

Learning Objectives

Indicator: 2.1.1.LI.3 - State principle of flotation.

By the end of the lesson, learners can:

State the principle of flotation in their own words, correctly relating the weight of a floating body to the weight of the fluid it displaces.
Compare the weights of floating and non-floating objects against the weights of the fluids they displace, using results from simple experiments.
Explain, using the principle of flotation, why some objects float in a given fluid while others sink.
Apply the principle of flotation to predict whether an object will float or sink when given its weight and the weight of fluid it can displace.
Demonstrate teamwork and responsible conduct while carrying out group investigations on floating and sinking.

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Curriculum details

Strand: Mechanics and Matter (Strand 1)
Sub-strand: Basic Physics (1.1)
Content standard: 2.1.1.CS.1 - Demonstrate knowledge and understanding of Flotation 2.1.1.LO.1 Use the concept of flotation and its related issues to identify substances that will float and give reasons why they will float.
Indicator: 2.1.1.LI.3 - State principle of flotation.
Suggested placement: Semester 1, Week 2 (Week 2 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. 88

Exemplars (from the NaCCA curriculum)

Collaborative Learning: Following from the activities in Archimedes' principle, let learners compare the weights of substances to their respective fluids they displace for both floating objects and non-floating objects and let learners draw conclusions from that.
Grouping must cater for vulnerable groups of learners. Opportunity for all to participate.
Assessment (2.1.1.AS.3). The document marks these depth-of-knowledge levels for this indicator: Level 2 Skills of conceptual understanding; Level 3 Strategic reasoning.
Teaching and Learning Resources:
- Stone
- Beaker
- Measuring cylinder
- Electronic
- Water balance
- Kerosene thread * Irregular shaped object
- Regular shaped piece of and wood * Salt spring balance