Density Basics
IGCSE Edexcel Physics
5.3-5.4 Density
Key Concepts:
Density is mass per unit volume: $\rho = m/V$.
Section A: Calculations
1. A block has mass 3.6 kg and volume $0.004\,m^3$. Calculate density.
[2]
2. A liquid has density $800\,kg/m^3$ and volume $0.002\,m^3$. Calculate mass.
[2]
Section B: Practical
3. Describe a method to find the density of an irregular solid.
[3]
Total marks: 7
Mark Scheme
1.
$\rho = 3.6/0.004 = 900\,kg/m^3$ [2]
2.
$m = \rho V = 800 \times 0.002 = 1.6\,kg$ [2]
3.
Measure mass; use displacement to find volume; density = mass/volume [3]