Lesson Plan

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Lesson Plan
Grade: Date: 01/12/2025
Subject: Physics
Lesson Topic: use SI base units to check the homogeneity of physical equations
Learning Objective/s:
  • Describe the concept of dimensional homogeneity and why it is essential for physical equations.
  • Identify the SI base units for the seven fundamental quantities.
  • Apply the step‑by‑step procedure to check the homogeneity of given equations.
  • Diagnose and correct common unit‑related errors in physics formulas.
Materials Needed:
  • Projector or interactive whiteboard
  • Printed worksheet with sample equations
  • Dimensional‑analysis cheat sheet
  • Scientific calculators
  • Whiteboard markers
 Introduction:
Begin with a quick “spot the error” challenge using a familiar equation. Review the seven SI base units that students have already learned. State that by the end of the lesson they will be able to verify any physics equation for dimensional consistency.
Lesson Structure:
  1. Do‑Now (5'): Students check a simple velocity equation for homogeneity on a slip sheet.
  2. Mini‑lecture (10'): Explain why homogeneity matters and recap SI base units.
  3. Guided practice (15'): Walk through the five‑step procedure using Newton’s second law and kinetic energy examples.
  4. Collaborative activity (15'): In pairs, students analyse three practice equations (pendulum period, electric power, and a faulty expression) and record their dimensional checks.
  5. Whole‑class feedback (10'): Groups share findings; teacher highlights common pitfalls.
  6. Exit ticket (5'): Each student writes one correct and one incorrect equation, justifying the homogeneity decision.
Conclusion:
Recap the five‑step checklist and emphasize its value as a quick error‑checking tool. Collect exit tickets to gauge understanding and assign a short homework task: complete a worksheet that requires students to verify the homogeneity of five additional equations.