Edexcel IGCSE Physics 5.5 Pressure Equation Questions

pressure = force / area;

Notes: allow standard symbols
and rearrangements e.g.
$\mathrm{p}=\mathrm{F} / \mathrm{A}$

Marking points:
- dimensionally correct substitution
- evidence of doubling area or halving pressure to account for both feet
- evaluation with matching unit

Example:
$$\text{pressure}=\frac{520}{156}$$$$\text{area}=156\times2$$$$\text{pressure}=\frac{520}{156\times2}=1.7\ \mathrm{N\,cm^{-2}}$$

Accept:
- ECF from 4(b)(i)
- $\mathrm{N\,cm^{-2}}$, $\mathrm{N\,m^{-2}}$, or $\mathrm{Pa}$ if no marks are awarded for the calculation
- $1.5\text{--}1.8\ \mathrm{N\,cm^{-2}}$
- $15000\text{--}18000\ \mathrm{N\,m^{-2}}$

Marking guidance:
- Allow 1 mark if a valid unit for pressure is given.