Kinematics · SHS3 Physics

Lesson notes

Learning Objectives

Indicator: 3.1.2.LI.3 - Explain the variation of potential and kinetic energy of body performing SHM.

By the end of the lesson, learners can:

Define potential energy and kinetic energy in the context of simple harmonic motion (SHM), and state the expressions for both forms of energy in terms of displacement and velocity.
Sketch and interpret graphs showing how potential energy and kinetic energy vary with displacement from the equilibrium position for a body performing SHM.
Identify the positions in the SHM cycle where potential energy is maximum, kinetic energy is maximum, and where the two are equal.
Apply the principle of conservation of mechanical energy to solve numerical problems involving energy transformations in SHM, including determining total energy from given values of mass, angular frequency and amplitude.
Explain, using energy concepts, why a simple pendulum or a mass on a spring continues to oscillate when displaced and released, referencing the exchange between potential and kinetic energy.

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Curriculum details

Strand: Mechanics and Matter (Strand 1)
Sub-strand: Kinematics (1.2)
Content standard: 3.1.2.CS.1 - Demonstrate knowledge and understanding of simple harmonic motion. 3.1.2.LO.1 Use the concept of simple harmonic motion to determine acceleration due to gravity.
Indicator: 3.1.2.LI.3 - Explain the variation of potential and kinetic energy of body performing SHM.
Suggested placement: Semester 1, Week 10 (Week 10 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. 157

Exemplars (from the NaCCA curriculum)

Experiential learning: Set up experiments for learners to determine the acceleration due gravity using simple pendulum and the helical spring.
Provide equitable access to resources and opportunities.
Assessment (3.1.2.AS.3). The document marks these depth-of-knowledge levels for this indicator: Level 1 Recall.
Teaching and Learning Resources:
- Audio-visuals
- Internet
- Projectors
- YouTube
- Interactive laboratory virtual
- Retort stand
- Spring with pointer
- Meter rule
- String
- Masses