# How to show the difference between force and pressure

A force can be a

**push**or a**pull**. When a force is exerted on an object it can change the object's speed, direction of movement or shape.Pressure is a measure of how much force is acting upon an area.

Pressure can be found using the equation

**pressure = force / area.**Therefore, a force acting over a smaller area will create more pressure.

## How do we measure pressure?

Mass is a measure of how much matter there is; force is the pull of the Earth's gravity on that mass. Each kg of mass is pulled down by the Earth with a force of 10 N.

We all have a **mass** (kg). To convert this to force (N) we **multiply** the mass by **10**.

We can then calculate pressure using: **pressure = force รท area.**

If you stand on one foot (rather than both feet), the pressure exerted would be twice as great. Similarly, a stiletto heel creates far more pressure than a normal shoe.

## Did you know?

A person wearing a stiletto can exert more pressure on the ground than an army tank! This is because the army tank uses caterpillar tracks to spread its weight (and therefore force) over a larger area, in order to reduce the pressure. If it didn't, it would sink into the ground and wouldn't get very far!

## Who uses knowledge of forces and pressure?

When structural engineers and architects design and construct a building, they need to make sure the foundation is strong enough and that the building doesn't sink into the ground.

## Where next?

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