30 multiple-choice questions covering all 4 topics of Unit 8 — density, pressure, buoyancy, continuity, and Bernoulli's equation. Use g = 10 m/s² and ρ_water = 1000 kg/m³.
For pressure problems, start with P = P₀ + ρgh. Identify your reference point (usually atmospheric at the surface) and figure out how deep your point of interest is.
For buoyancy, write F_b = ρ_fluid · V_displaced · g. The fluid's density, NOT the object's. Common error.
For floating, the fraction submerged equals the density ratio. ρ_object / ρ_fluid tells you what fraction is under water.
For pipe-flow problems, apply continuity FIRST (A₁v₁ = A₂v₂) to find unknown velocities. Then use Bernoulli for pressures.
Bernoulli's surprise: faster flow has LOWER pressure. That's why airplane wings produce lift.