LuduminaFM-17 · FM-U6 · Planned
Fluid and atmospheric pressure
Learning objectives
Calculate normal-force pressure; explain atmospheric-pressure change with altitude.
8463 §§4.5.5.1.1,4.5.5.2 / No Trilogy counterpart
DfE single-science pp.35–37 / Combined pp.30–32. Evidence checked 30 September–1 October 2026. Skills: WS1.2,4.5; MS3b,3c,5c.
Needs firstFM-02; PM-01,PM-05 before this branch
Explanation
Fluid pressure produces forces normal to surfaces. Atmospheric pressure comes from air-particle collisions and decreases with altitude as there is less air above and lower density. Area conversions need squared units.
Concepts, equations and units: p=F/A; Pa=N/m²; F normal in N; A in m²; atmosphere particle model.
Prediction, demonstration and game exercise
Predict, observe, explain
Compare contact areas and pressure gauges in a gas/liquid; ascend a model atmosphere with density labels.
Planned learner game exercise
Choose support-foot areas for a load; match altitude measurements to a particle explanation.
Independent practice
Three area-conversion pressure problems and a four-step altitude explanation.
Original practice example · Separate Physics
A normal force of 100 N acts over 0.020 m². Find pressure.
Show working and model answer
Working / reasoning
p = F/A = 100/0.020.
Answer
5000 Pa.
Exit check and success criteria
Two correct calculations and lower pressure linked to fewer particles/less air above.
During practice, compare the prediction with evidence and give an error-specific prompt. The exit item uses a fresh context or fresh values, answered independently.
Misconceptions, practical links and mastery
Check these misconceptions
Pressure acts only downwards; air has no mass; convert cm² as if it were cm.
Practical preparation
Optional pressure demonstrations, AT1,2; no pressure-vessel handling in game instructions.
Virtual preparation and revision only. Required hands-on activities and school records remain separate.
Proposed mastery
0: not yet evidenced. 1: supported. 2: independent exit criteria met. 3: successful changed-context transfer. Advance at 2; revisit with fresh retrieval. These are not GCSE grades.