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Density and pressure
Explore density and pressure within forces in action. Start with the object and draw all forces acting on it. Their vector sum determines acceleration; zero resultant force gives constant velocity, including rest.
Specification outcomes (3)
- 3.2.4(a) Define density; ρ = m / V.
- 3.2.4(b) Define pressure; p = F / A for solids, liquids and gases.
- 3.2.4(c) Use p = hρg to calculate pressure in fluids; understand upthrust and Archimedes’ principle.
H156 v2.0 · May 2026
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