👩 Teacher’s Guide

🎯 Objective

Students will be able to:

• Use speed = distance ÷ time and rearrange it
• Convert units correctly between m/s and km/h
• Check answers for reasonableness using estimation

📝 Teaching Notes

• Key idea to emphasize: The equation speed = distance ÷ time connects three measurable quantities.
• Common misconception: Mixing units (km with seconds, etc.).
• Suggested teaching approach:
  • Do unit-conversion warmups (km/h ↔ m/s).
  • Practice rearranging: distance = speed × time, time = distance ÷ speed.
  • Check answers using estimation.

💬 Discussion Starter

Ask students:

• How can two journeys have the same average speed but different motion?
• Why do units matter as much as the numbers?
• How can graphs tell a story about motion?

🧒 Student Worksheet

Concept and Helping Material

You can calculate speed using speed = distance ÷ time. Converting units correctly (m, km, s, h) is essential for accurate answers.

Vocabulary and Definitions

• — A rule written with symbols, such as speed = distance ÷ time.
• — Change the subject of an equation.
• — Change units without changing the physical amount.
• — Kilometres per hour, a common speed unit.
• — Make a sensible approximate calculation to check an answer.

Hands-On Experiment or Activities

Activity 1: Unit Conversion Stations
What You Need: conversion cards, calculator.
What You Do: Convert between km/h and m/s and explain the factor used (÷3.6 or ×3.6).
Think and Talk: What changed? What stayed the same?

Activity 2: Formula Triangle Practice
What You Need: worksheet, calculator.
What You Do: Use a triangle diagram to rearrange speed, distance, and time for different questions.
Think and Talk: What changed? What stayed the same?

Practice Questions (QA)

1. Write the speed equation.
2. Rearrange to find distance.
3. Rearrange to find time.
4. Convert 72 km/h to m/s.
5. Convert 10 m/s to km/h.
6. A car travels 150 km in 2 h. Average speed?
7. A cyclist at 6 m/s rides for 50 s. Distance?
8. A runner covers 400 m at 8 m/s. Time?
9. Why check unit consistency?
10. What is a sensible speed estimate for walking?

Reflection

• Where do you see this idea in sports, travel, or everyday movement?
• What is one measurement or graph habit that would improve your answers?