A 40 N normal force acts over 0.2 m². Find average pressure.
Answer and explanation
200 Pa
40/0.2 = 200 Pa.
Subjects
Pressure & fluids
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Sample exercises
At the same normal force, halving area does what to pressure?
- Doubles it
- Halves it
- Leaves it unchanged
Answer and explanation
Doubles it
Pressure is inversely proportional to area at fixed force.
A liquid has density 1000 kg/m³. At depth 2 m, with g = 10 m/s², find pressure above surface pressure.
Answer and explanation
20000 Pa
ρgh = 1000 × 10 × 2 = 20000 Pa.
Surface pressure is 100000 Pa and the liquid adds 15000 Pa. Find absolute pressure.
Answer and explanation
115000 Pa
Add baseline and increase: 100000 + 15000.
Which quantity is measured in pascals?
- Force
- Pressure
- Energy
Answer and explanation
Pressure
One pascal is one newton per square metre.
Why is 100 cm² not equal to 1 m²?
Answer and explanation
Area conversions square the length conversion; 1 m² is 10000 cm².
Credit two dimensions rather than multiplying by only 100.
Study notes
Pressure, area and depth
Do not confuse pressure with force or absolute with additional pressure.
Grades 7–10Pressure, area and depth · Revision sheet
Do not confuse pressure with force or absolute with additional pressure.
Grades 7–10Displacement, density and buoyancy
Use displaced fluid weight and avoid shape-only explanations of floating.
Grades 8–11Displacement, density and buoyancy · Revision sheet
Use displaced fluid weight and avoid shape-only explanations of floating.
Grades 8–11Pressure on a surface
Use the normal force and contact area in square metres.
Grades 7–10Liquid pressure increase
This is pressure above the surface pressure, not absolute pressure.
Grades 9–12Buoyancy from displaced volume
Use the density of the fluid and displaced fluid volume, not the object’s density.
Grades 9–12Pressure & fluids · Formula reference
Formula reference
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