Lesson Plan

• Recall the five SI base quantities and their symbols.
• Identify the correct SI unit for each base quantity.
• Decompose a derived unit (e.g., joule) into its base‑unit components.
• Explain why base units are fundamental for all other physics units.

• Projector and screen
• Printed handout of SI base quantities and units
• Worksheet with recall exercise
• Whiteboard and markers
• Everyday objects (textbook, ruler, stopwatch, battery, thermometer)
• Calculators (optional)

Begin with a quick “What’s this?” game showing everyday objects and asking students which physical quantity they represent. Review that students already know the symbols for mass, length, time, current and temperature from previous lessons. State that by the end of class they will be able to name each quantity, its unit, and use them to break down derived units.

1. Do‑now (5'): Students write the SI unit for each of the five base quantities from memory; teacher collects for quick check.
2. Mini‑lecture (10'): Using projector, review the five base quantities, symbols, and why they underpin all derived units.
3. Guided practice (10'): Whole‑class work on expressing the joule (J) in base units and relating ampere to coulomb.
4. Quick recall quiz (5'): Students complete the three‑item exercise on the worksheet, then peer‑check answers.
5. Real‑world connections (5'): Match the everyday objects to their corresponding base quantity and discuss relevance.
6. Exit ticket (5'): Each student writes one sentence explaining how knowing base units helps solve physics problems.

Summarise the five base quantities, their symbols and units, and highlight how they were used to decompose the joule. Collect exit tickets as a retrieval check. For homework, assign an online quiz where students must match derived units to their base‑unit expressions.