Lesson Plan

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Lesson Plan
Grade: Date: 03/03/2026
Subject: Physics
Lesson Topic: Calculate speed from the gradient of a straightline section of a distance-time graph
Learning Objective/s:
  • Describe how the gradient of a straight‑line segment on a distance‑time graph represents average speed.
  • Calculate speed by determining Δd and Δt from two points on a uniform‑motion segment.
  • Apply correct units and check calculations for accuracy.
  • Identify common errors when interpreting distance‑time graphs.
Materials Needed:
  • Projector or interactive whiteboard
  • Printed distance‑time graph worksheets
  • Rulers or straight‑edge
  • Calculator
  • Whiteboard and markers
  • Exit‑ticket slips
 Introduction:
Begin with a quick real‑world example, such as a car’s journey, to show how speed can be read from a graph. Recall that distance‑time graphs plot distance on the vertical axis and time on the horizontal axis. Today students will learn to extract the gradient of a straight‑line segment and convert it into a speed, with success measured by correctly solving the practice questions.
Lesson Structure:
  1. Do‑now (5'): Students answer a short question on reading axes of a distance‑time graph.
  2. Mini‑lecture (10'): Explain the gradient concept and the formula v = Δd/Δt, then demonstrate a worked example.
  3. Guided practice (12'): In pairs, identify a straight‑line segment on a provided graph, choose two points, calculate Δd, Δt, and the speed.
  4. Whole‑class check (8'): Discuss pair results, highlight common mistakes such as using vertical distance alone or mixing units.
  5. Independent practice (10'): Students complete three worksheet questions while the teacher circulates.
  6. Exit ticket (5'): Each student records the speed they found for one question and one tip to avoid errors.
Conclusion:
Summarise that the gradient of a straight‑line portion directly gives the constant speed, reinforcing the v = Δd/Δt relationship. Ask a few students to share their answers as a quick retrieval check. Collect exit tickets and assign a short homework: create a distance‑time graph for a given motion and calculate its speed.