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An African elephant exerts pressure on the ground on which it stands. That pressure is measured in pascals.

Pressure 01

Pressure is an important concept in KS3 Science. It explains how force acts over an area and helps us understand everyday things like shoes, nails, and hydraulics.

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Fascinating Fact:

Pressure is the force spread over an area, and it is measured in Pascals (Pa).

In KS3 Science, pupils learn how pressure affects solids, liquids, and gases. It explains why sharp knives cut better, why we use snowshoes, and how suction works.

Key Terms

Force: A push or pull acting on an object, measured in newtons (N).
Area: The surface over which a force is applied, measured in square metres (m²).
Pressure: The amount of force applied per unit area, measured in Pascals (Pa).

Frequently Asked Questions (Click to see answers)

What is the formula for pressure in KS3 Science?

The formula for pressure is Pressure = Force ÷ Area. This shows how a force is spread out over a surface.

Why do sharp knives cut better than blunt ones?

Sharp knives cut better because the force is concentrated on a smaller area, creating higher pressure and making it easier to slice through materials.

What units are used to measure pressure?

Pressure is measured in Pascals (Pa), which equals one newton of force applied over one square metre of area.

Try These Related Quizzes

1 .

What is force measured in?

Joules

Kilograms

Newtons

Pascals

Although the symbol for force is a capital N, when writing it down, unless it is at the start of a sentence, it is written as newton, without a capital letter

2 .

What are the SI units of pressure?

Joules

Kilograms

Newtons

Pascals

1 Pa = 1 N / 1 m²

3 .

If pressure is measured in pascals, Pa, and force in newtons, N, then area is measured in .......

cm²

km²

m²

mm²

You always need to be careful about which units you use

4 .

If pressure increases then .......

force and area are doubled

force and area are halved

force increases or area decreases

force increases or area increases

This is because pressure = force/area

5 .

A box weighs 100 N. The area of the box on the ground is 20 m². What is the pressure of the box on the ground?

0.02 Pa

5 Pa

50 Pa

2,000 Pa

Pressure = force/area = 100 N/20 m² = 5 Pa

6 .

A box weighs 60 N. The dimensions of the base are 3 m by 2 m. What is the pressure of the box on the ground?

10 Pa

12 Pa

20 Pa

30 Pa

Pressure = force/area, area = 3 m x 2 m = 6 m², pressure = 60/6 = 10 Pa

7 .

A sheet of metal in a factory weighs 60 N. Its dimensions are 2 m by 1 m. What is the pressure it puts on the ground?

6 Pa

20 Pa

30 Pa

60 Pa

Area of metal sheet = 2 m x 1 m = 2 m² so pressure = 60/2 = 30 Pa

8 .

A student weighs 600 N. The area of one foot is 0.01 m². If she stands on two feet what is the pressure on the ground?

300 Pa

6,000 Pa

30,000 Pa

60,000 Pa

Area of two feet = 0.01 x 2 = 0.02 pressure = 600/0.02

9 .

The dimensions of the base of a box are 80 cm by 100 cm. It weighs 400 N. What is the pressure on the ground?

50 Pa

80 Pa

400 Pa

500 Pa

80 cm = 0.8 m, 100 cm = 1 m, area = 0.8 x 1 = 0.8 m², pressure = 400/0.8 = 500 Pa

10 .

The size of an African elephant's foot is 40 cm by 50 cm. The elephant weighs 64,000 N. When standing on the ground, what is the pressure it exerts?

40,000 Pa

80,000 Pa

240,000 Pa

300,000 Pa

Area of foot = 40 cm x 50 cm = 0.4 m x 0.5 m = 0.2 m², area of four feet = 0.8 m², pressure = 64,000/0.8

You can find more about this topic by visiting BBC Bitesize - Forces, Pressure and Speed

Author: Sue Davison (Chemistry Specialist & KS3 Science Teacher, Quiz Writer)

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