Fig. 3.1 presents a very thin plastic sheet. A student attempts to find the sheet's thickness with a ruler, but the sheet is too thin for an accurate reading. The student measures the mass of the sheet and records $0.12\,\text{g}$.
(a(i))[1]
State what mass means.
(a(ii))[2]
Since the plastic has density $0.91\,\text{g cm}^{-3}$, calculate the volume of the plastic sheet.
(a(iii))[2]
The student measures the sheet's length and width. The recorded values are: length of sheet $= 3.0\,\text{cm}$, width of sheet $= 2.0\,\text{cm}$. Calculate the thickness of the sheet.
(b)[1]
State a measuring instrument that could be used to measure the thickness of the sheet accurately.
Worked solution & mark scheme
This 6-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Quantity of matter/substance, or how much an object resists changes in its state of motion” …