Lesson Plan

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Lesson Plan
Grade: Date: 25/02/2026
Subject: Physics
Lesson Topic: Describe solid friction as the force between two surfaces that may impede motion and produce heating
Learning Objective/s:
  • Describe the nature of solid friction and differentiate between static and kinetic friction.
  • Explain how frictional force relates to the normal reaction and coefficient of friction.
  • Analyse factors that affect the magnitude of solid friction.
  • Calculate frictional force and the associated temperature rise using the given formulas.
  • Apply knowledge of friction to real‑world examples such as brakes and vehicle tyres.
Materials Needed:
  • Projector and screen
  • Whiteboard and markers
  • Printed handout with key formulas and coefficient tables
  • Wooden blocks, rubber pads, and spring scales for a friction demo
  • Stopwatch and ruler
  • Worksheet with practice problems
 Introduction:

Begin with a quick demonstration of a book sliding across a table to spark curiosity about why it slows down. Recall students’ prior knowledge of forces and motion, linking it to the idea of a resistive force. State that by the end of the lesson they will be able to describe solid friction, calculate its magnitude, and explain its heating effect.
Lesson Structure:
  1. Do‑now (5') – Students answer three short questions on forces and motion on the board.
  2. Mini‑lecture (10') – Define solid friction, contrast static vs kinetic, and introduce f = μR using projected diagrams.
  3. Demonstration (10') – Pull a block with a spring scale on different surfaces; discuss observed differences in force.
  4. Guided practice (12') – Solve example problems calculating frictional force and temperature rise on the worksheet.
  5. Concept check (8') – Quick quiz (clickers/hand signals) to identify static/kinetic cases and influencing factors.
  6. Real‑world application (8') – Analyse car brakes and tyre grip scenarios, linking theory to everyday technology.
  7. Summary & exit ticket (5') – Students write one key takeaway and one lingering question on a sticky note.
Conclusion:

Review the four key points about solid friction, emphasising the opposite direction of the force and its heating effect. Collect exit tickets to gauge understanding and assign a worksheet for homework that reinforces calculations and real‑world examples.