CAIE A-Level Physics 4.3.2 Pressure
Practise defining pressure as normal force per unit area, calculating or rearranging p = F/A and interpreting geometry, units and applications.
- Syllabus
- 2028–2030
- Course
- Physics 9702
- Level
- AS
Exam points
- define pressure as normal force per unit area and express it in appropriate SI units
- calculate pressure from force and area, including the weight of an object on a surface, with correct area geometry and unit conversion
- rearrange p = F/A to determine force or area and interpret pressure in applications such as fluids, brakes, windows or solar radiation
4.3.2—Pressure question 1
A beaker in air contains a liquid. The base of the beaker is in contact with the liquid and has area A, as shown in Fig. 4.1.
Fig. 4.1
The liquid has density and fills the beaker to a depth h.
Suggest why the equation in (a) does not give the total pressure on the base of the beaker.
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