| Lesson Plan |
| Grade: |
Date: 01/12/2025 |
| 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.
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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
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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.
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Lesson Structure:
- Do‑now (5') – Quick quiz on wave terminology (amplitude, wavelength, frequency); teacher checks answers.
- Mini‑lecture (10') – Define progressive wave, present y(x,t)=A cos(kx‑ωt+φ), and introduce kinetic & potential energy expressions.
- Demonstration (10') – Oscillating string or computer simulation; highlight particle oscillation versus energy flow; annotate diagram.
- Guided practice (12') – Students calculate average energy density ⟨𝔈⟩ and power ⟨P⟩ for given A, ω, μ, v using worksheets.
- Concept check (8') – Clicker questions to confront misconceptions about mass transport and the role of amplitude.
- Summary & reflection (5') – Students write a one‑sentence summary; teacher reinforces key relationships.
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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.
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