21.1
Pressure on surfaces
Pressure = force ÷ area, the pascal, and why sharp things cut while snowshoes stop you sinking.
21.2
Pressure in liquids
Liquid pressure increases with depth and pushes in every direction: dams, divers, submarines and brakes.
21.4
Atmospheric pressure
The weight of the air, how air pressure falls with height, and air pressure at work.
Daily 5
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What this unit covers
Mapped to the KS3 national curriculum (Physics: pressure in fluids).
| Programme of study | Lesson |
|---|---|
| pressure measured by ratio of force over area – acting normal to any surface | 21.1 |
| pressure in liquids, increasing with depth; upthrust effects, floating and sinking | 21.2, 21.3 |
| atmospheric pressure, decreases with increase of height as weight of air above decreases with height | 21.4 |
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