Pressure is the force per unit area .

True or False? Pressure is measured in pascals (Pa).

True. Pressure is measured in pascals (Pa) , where 1 Pa = 1 N/m².

What is the relationship between force, area and pressure?

A force applied over a large area produces a small pressure , while the same force over a small area produces a large pressure .

False. A high-heeled shoe produces a higher pressure , because the same weight acts over a smaller area .

Large tyres spread the tractor's weight over a large area , reducing the pressure on the ground. This stops the tractor from sinking into soft mud.

Its sharp point has a very small area , so the applied force is concentrated to produce a large pressure .

Exam code: 0654 & 0973

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What is pressure?
Pressure is the force per unit area.
State the equation relating pressure, force and area.
$p = \frac{F}{A}$
Where:
- p = pressure in pascals (Pa)
- F = force in newtons (N)
- A = area in m²
True or False?
Pressure is measured in pascals (Pa).
True.
Pressure is measured in pascals (Pa), where 1 Pa = 1 N/m².
What is the relationship between force, area and pressure?
A force applied over a large area produces a small pressure, while the same force over a small area produces a large pressure.
True or False?
A high-heeled shoe produces the same pressure on the ground as a flat shoe worn by the same person.
False.
A high-heeled shoe produces a higher pressure, because the same weight acts over a smaller area.
Why do tractors have large tyres?
Large tyres spread the tractor's weight over a large area, reducing the pressure on the ground. This stops the tractor from sinking into soft mud.
Why can a drawing pin be pushed into a wall easily?
Its sharp point has a very small area, so the applied force is concentrated to produce a large pressure.
A box is placed on a table. Calculate the pressure the grey face of the box exerts on the table.
The pressure is 4 Pa.
$A = 3 \times 2 = 6 m^{2}$
$p = \frac{F}{A} = \frac{24}{6} = 4 Pa$

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