Basic Physics · SHS2 Physics

Lesson notes

Learning Objectives

Indicator: 2.1.1.LI.2 - Determine the resultant of two vectors.

By the end of the lesson, learners can:

Define resultant vector as the single vector that produces the same effect as two or more vectors acting together.
Determine the magnitude of the resultant of two vectors acting in the same or opposite directions along a straight line.
Determine the magnitude and direction of the resultant of two perpendicular vectors using Pythagoras’s theorem and the tangent ratio.
Use the parallelogram law to determine the resultant of two vectors acting at an angle other than 90 degrees.
Apply the concept of resultants to solve simple physical problems involving forces, displacements and velocities.

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Curriculum details

Strand: Mechanics and Matter (Strand 1)
Sub-strand: Basic Physics (1.1)
Content standard: 2.1.1.CS.3 - Demonstrate knowledge and understanding of vectors 2.1.1.LO.3 Use the concept of vectors to represent quantities
Indicator: 2.1.1.LI.2 - Determine the resultant of two vectors.
Suggested placement: Semester 1, Week 4 (Week 4 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. 91

Exemplars (from the NaCCA curriculum)

Collaborative learning: In mixed-ability group of 5, give learners two vectors of the same quantity but different magnitudes and directions as components of a vector and let learners determine the magnitude and direction of the resultant vector.
Assessment (2.1.1.AS.2). The document marks these depth-of-knowledge levels for this indicator: Level 3 Strategic reasoning.
Teaching and Learning Resources:
- Paper
- Ruler
- Protractors
- Calculator
- Computer