4.3 Density and pressure

6 of 6 objectives have lessons · 0 studied · 0 secure

Lessons

Density: mass packed into spaceDensity is mass per unit volume; use rho = m / V to compare how much matter fits into a space. 4 min, not started
Pressure: force spread over areaPressure is normal force per unit area, so the same force creates more pressure over a smaller area. 4 min, not started
Where the liquid-pressure equation comes fromStart with density and pressure definitions to derive the pressure increase through a liquid depth. 5 min, not started
Calculating pressure changes in a liquidUse liquid density, gravitational field strength and vertical depth to calculate a hydrostatic pressure difference. 4 min, not started
Upthrust: pressure pushes backPressure is greater on the lower face of a submerged object, producing upthrust equal to the weight of displaced fluid. 5 min, not started

6 objectives

What Cambridge says you should be able to do, in our words. Codes are the topic number plus the objective’s position.

4.3.1

Define density and use the definition.

Taught in: Density: mass packed into space · 5 questions

4.3.2

Define pressure and use the definition.

Taught in: Pressure: force spread over area · 5 questions

4.3.3

Starting from the definitions of pressure and density, derive the hydrostatic pressure equation Δp = ρgΔh.

Taught in: Where the liquid-pressure equation comes from · 5 questions

4.3.4

Use Δp = ρgΔh.

Taught in: Calculating pressure changes in a liquid · 6 questions

4.3.5

Understand that the upthrust on an object in a fluid arises from a difference in hydrostatic pressure.

Taught in: Upthrust: pressure pushes back · 2 questions

4.3.6

Use F = ρgV (Archimedes’ principle) to calculate the upthrust on an object in a fluid.

Taught in: Upthrust: pressure pushes back · 4 questions