This exam tips covers Exam Tips for Density within Density for GCSE Physics. Revise Density in Particle Model for GCSE Physics with 13 exam-style questions and 30 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 12 of 13 in this topic. Treat this as a marking guide for what examiners are looking for, not just a fact list.
Topic position
Section 12 of 13
Practice
13 questions
Recall
30 flashcards
💡 Exam Tips for Density
🎯 Common Question Types:
- Calculate density given mass and volume (2 marks)
- Describe the displacement method for irregular objects (3 marks)
- Explain why an object floats or sinks (2 marks)
- Identify sources of error in the density practical (2 marks)
📝 Key Command Words:
- Calculate: Use ρ = m/V, show working, give units
- Describe: Give step-by-step method for practical
- Explain: Compare densities and state the consequence (float/sink)
- Suggest: Often asks why results might be inaccurate
⚠️ Common Mistakes to Avoid:
- Forgetting to state units — always include kg/m³ or g/cm³
- Confusing mass and weight in density questions
- Using V₂ instead of V₂ − V₁ for displacement volume
- Mixing up g/cm³ and kg/m³ without converting (multiply by 1000)
Quick Check: Describe the displacement method for finding the volume of a small stone. What equipment do you need and what do you measure?
Equipment: measuring cylinder, water. Method: part-fill cylinder with water, record initial volume (V₁). Lower stone fully into water, record new volume (V₂). Volume of stone = V₂ − V₁. Then use ρ = m/V with mass measured separately on a balance.