Edexcel A-Level Physics Density

Practise Edexcel A-Level Physics density through mass-volume calculations, unit conversions, experimental methods, uncertainty comparisons and material identification.

Exam points

calculate density, mass or volume using ρ=m/V with solids, liquids or flowing fluids
convert units and use geometric volumes for prisms, spheres, cubes, pipes or paper stacks
compare calculated density with material ranges using percentage uncertainty or difference

[Maximum number: 4]

A student was given a collection of old coins.
She placed the coins alongside a ruler, as shown, to determine the diameter and thickness of the coins.

Figure for Question 1.4.23 - Density question 1 — Edexcel A-Level Physics AS

(a)

The mass of the 20 coins shown is 196 g .

Determine the average density of the coins.

Average density =

[ 2 ]

Use of $\rho=m / V$

- $\rho$ between 8000 and $8600 \mathrm{~kg} \mathrm{~m}^{-3}$

Allow ecf for V from 1(a) for both marks.

Example of calculation

$\rho=m / V$ $\rho=0.0098 \mathrm{~kg} / 1.18 \times 10^{-6} \mathrm{~m}^{3}$ $\rho=8300 \mathrm{~kg} \mathrm{~m}^{-3}$

(b)

Determine whether the coins could be made from brass.
density of brass $=8550 \mathrm{~kg} \mathrm{~m}^{-3} \pm 2 \%$

[ 2 ]

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1.4.23 - Density question 1

Question (a)

Question (b)