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Recall and explain
An upright piano stands on four small wheels on a soft wooden floor. Each wheel touches the floor over 2.0 cm². (a) Calculate the total area of the four wheels in m². (b) The floor dents under a pressure of more than 2 500 000 Pa. Calculate the largest weight that the floor can carry on these four wheels. (c) The piano weighs 2500 N. Use your answer to (b) to deduce whether the wheels dent the floor. (d) Suggest one thing to put under the wheels to stop the dents, and explain how it works.
calculate: work out the answer from the data. deduce: reach a conclusion from the information given. suggest: apply what you know to this case. explain: give reasons and connect them to evidence.
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Scope and sources
Cambridge IGCSE Physics 0625 · 2026–2028 v2 · Original learning materials.
Pressure as force per unit area, p = F/A (1.8.1); how pressure varies with force and area in everyday examples (1.8.2); qualitatively, how the pressure beneath the surface of a liquid changes with depth and with the density of the liquid (1.8.3); Supplement: the change in pressure beneath the surface of a liquid, ∆p = ρg∆h (1.8.4). Atmospheric pressure beyond one sentence, hydraulics, upthrust and floating are not covered; gas pressure is in Gas pressure.
Apparatus, amounts and times in the experiment are illustrative. Real practical work follows a teacher-approved safety method.
Official Cambridge syllabus