Lesson Plan

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Lesson Plan
Grade: Date: 17/01/2026
Subject: Physics
Lesson Topic: understand that energy is transferred by a progressive wave
Learning Objective/s:
  • Describe the definition of a progressive wave and distinguish it from a standing wave.
  • Explain how kinetic and potential energy are stored in the medium of a transverse wave.
  • Calculate the average energy density and power transmitted for a harmonic wave using the given formulas.
  • Analyse how amplitude and frequency affect the intensity of a progressive wave.
  • Identify and correct common misconceptions about energy transport in waves.
Materials Needed:
  • Projector or interactive whiteboard
  • Slides with wave equations and diagrams
  • String and oscillator (or simulation software) for demonstration
  • Handout summarising key formulas and misconceptions
  • Worksheet with calculation problems
  • Ruler or measuring tape for wave demonstrations
 Introduction:
Begin with a short video of a stadium “wave” and ask students what is actually moving. Recall previous lessons on wave properties such as amplitude, wavelength and frequency. State that today they will discover how a progressive wave transports energy without moving mass and will be able to quantify that energy transfer.
Lesson Structure:
  1. Do‑now (5') – Quick quiz on wave terminology (amplitude, wavelength, frequency); teacher checks answers.
  2. Mini‑lecture (10') – Define progressive wave, present y(x,t)=A cos(kx‑ωt+φ), and introduce kinetic & potential energy expressions.
  3. Demonstration (10') – Oscillating string or computer simulation; highlight particle oscillation versus energy flow; annotate diagram.
  4. Guided practice (12') – Students calculate average energy density ⟨𝔈⟩ and power ⟨P⟩ for given A, ω, μ, v using worksheets.
  5. Concept check (8') – Clicker questions to confront misconceptions about mass transport and the role of amplitude.
  6. Summary & reflection (5') – Students write a one‑sentence summary; teacher reinforces key relationships.
Conclusion:
Recap that progressive waves carry energy via oscillating particles, with energy proportional to A² and ω². For the exit ticket, ask learners to write the formula for average power and note one factor that increases intensity. Assign a problem set on energy density for strings and sound waves as homework.