KS3 Density Lesson | Year 7 Physics + Worksheets

Density lesson for KS3 Physics, Year 7 Matter (lesson 3 of 6): a ready-to-teach PowerPoint, three differentiated worksheets and full answers.

Learning objectives

• Bronze (all): Describe density as how much mass is in a given volume, and predict floating and sinking.
• Silver (most): Calculate density using density = mass ÷ volume, with units g/cm³.
• Gold (some): Measure the density of regular and irregular objects, and explain the anomaly of ice and water.

What’s included

• 15-slide PowerPoint: Do Now retrieval, objectives, hook, key words, teaching slides, we-do example, hinge question, practical or data task, challenge, myth busters, exit ticket and homework, with answers in the speaker notes
• Worksheet 1 Support (word bank, sentence starters), Worksheet 2 Core and Worksheet 3 Challenge
• Answers for every slide and worksheet
• Lesson plan with timings, misconceptions and differentiation
• Teacher notes with subject knowledge, prep list and timing tips

Fully editable Microsoft PowerPoint and Word files, aligned to the KS3 National Curriculum. Ideal for specialist and non-specialist teachers.

Part of the Year 7 Matter unit

1. The Particle Model
2. Changes of State
3. Density
4. Diffusion and Brownian Motion
5. Temperature and Internal Energy
6. Review lesson + 40-mark end-of-unit test

Find the other lessons and the full unit in my KS3 Physics resources.

Last updated: 27 October 2026.