Lesson Plan

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Lesson Plan
Grade: Date: 01/12/2025
Subject: Physics
Lesson Topic: recall and use Hooke’s law
Learning Objective/s:
  • Describe the definitions and units of stress and strain.
  • Explain Hooke’s law and its connection to Young’s modulus.
  • Apply Hooke’s law to calculate stress, strain, and extension for a given material.
  • Identify the elastic region and the limits of Hooke’s law on a stress‑strain graph.
  • Compare typical Young’s modulus values for common materials.
Materials Needed:
  • Projector or interactive whiteboard
  • Slides/handout with definitions and formulas
  • Calculator or computer algebra tool
  • Data sheet of material Young’s moduli
  • Worksheet with practice problem (steel‑rod example)
  • Ruler or digital measurement tool for demonstration (optional)
 Introduction:
Begin with a quick demonstration: hang a spring scale on a rubber band and ask students what they observe as the force increases. Recall prior knowledge of force, area, and deformation, linking to the definitions of stress and strain. Explain that today’s success criteria are to accurately use Hooke’s law to solve for stress, strain, or extension and to recognise its limits on a stress‑strain graph.
Lesson Structure:
  1. Do‑now (5’) – Short quiz on stress and strain definitions.
  2. Mini‑lecture (10’) – Present Hooke’s law, Young’s modulus, and the linear elastic region with diagram.
  3. Guided example (12’) – Walk through the steel‑rod calculation, students fill steps on worksheet.
  4. Interactive simulation (8’) – Use an online stress‑strain app to vary force and observe the proportional limit; discuss limits of Hooke’s law.
  5. Collaborative practice (10’) – Pairs solve a new problem for a different material and check with answer key.
  6. Formative check (5’) – Exit ticket: write the formula for strain given stress and Young’s modulus.
  7. Summary discussion (5’) – Review key points and common misconceptions.
Conclusion:
Summarise how stress, strain, and Young’s modulus interrelate and why Hooke’s law only applies within the elastic region. For the exit ticket, students write the strain formula to demonstrate retrieval. Assign homework: complete a worksheet converting between stress, strain, and extension for three materials and sketch their stress‑strain curves.