Pressure is how much force there is on a given area. So, whilst an elephant weighs more than a horse, the horse pushes down with a bigger pressure. This is because the areas of their feet are different.
Pressure depends on two variables: force and area.
Let's see what effect they have on pressure.
Picture 3.1 How do the pressures compare?
Looking at force
To make it a fair test, we will keep the area constant (the area of the acrobats' feet).
Look at the acrobats in picture 3.1.
The brother at the front is on his own.
The twin brothers behind are doing a piggy back. So the force on the ground is bigger than for their brother - it has been doubled.