Lesson Plan

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Lesson Plan
Grade: Date: 17/01/2026
Subject: Physics
Lesson Topic: Know that forces may produce changes in the size and shape of an object
Learning Objective/s:
  • Describe how different types of forces cause deformation of objects.
  • Distinguish between elastic and plastic deformation and identify the elastic limit.
  • Calculate stress and strain and use Young’s modulus to relate them.
  • Classify deformation types (compression, tension, shear, torsion, bending) from given scenarios.
  • Apply knowledge to solve exam‑style questions on force‑induced shape changes.
Materials Needed:
  • Projector and screen for diagrams.
  • Whiteboard and markers.
  • Demo set: spring, rubber band, sponge, soft clay, metal rod, ruler.
  • Worksheet with force‑deformation tables and stress‑strain problems.
  • Calculator for quantitative calculations.
 Introduction:
Begin with a quick demonstration: compress a spring and stretch a rubber band, asking students what they notice about the objects' shapes. Recall prior learning about forces causing motion and introduce today’s focus on forces that change size or shape. Explain that by the end of the lesson they will be able to identify deformation types, differentiate elastic from plastic behaviour, and perform basic stress‑strain calculations.
Lesson Structure:
  1. Do‑now (5’) – Short quiz on force definitions and previous motion concepts.
  2. Demonstration & discussion (10’) – Teacher shows compression, tension, shear, torsion, bending examples; students label each deformation type.
  3. Concept input (15’) – Mini‑lecture on deformation, elastic vs plastic, stress, strain, Young’s modulus with worked examples.
  4. Guided practice (10’) – Whole‑class calculation of stress and strain from provided data; identify elastic limit.
  5. Hands‑on activity (15’) – Small groups experiment with sponge, clay, and metal rod; record observations and classify deformation.
  6. Check for understanding (5’) – Exit ticket: one scenario, state force type, deformation, and whether it is elastic or plastic.
  7. Summary & homework briefing (5’) – Recap key points and assign worksheet problems.
Conclusion:
Summarise how forces can alter an object’s size or shape and the distinction between temporary and permanent deformation. Ask a few students to share their exit‑ticket answers to reinforce learning. For homework, complete the worksheet calculating stress, strain and identifying deformation types in new situations.