Step by step
The question
Question: find the force when the pressure is 40 N/m² and the area is 6 m².
1 Write the rule
The rule: pressure is the force divided by the area.
Pressure tells us how much force pushes on 1 m².
So its unit is N per m².
2 Put the numbers in
The pressure is 40.
The area is 6.
The force is what we want: we call it f.
Careful!
The force goes on the top.
The unit, N/m², shows it: N on the top.
3 Remove the fraction
The bottom number is 6.
Times 6 will remove it.
We multiply both sides by 6, so they stay equal.
6 divided by 6 is 1.
So just f is left.
Write what is left.
6 times 40 is 240.
Let's swap the two sides, so f is on the left.
So f = 240.
4 Check
Let's check: 240 divided by 6 is 40.
That is the pressure.
So the answer is right!
So the force is 240 N.
Let's look back.
First: write the rule.
Then: put the numbers in.
Then: remove the fraction.
Last: check.