# Calculating pressure.

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Thread starter 4 years ago
#1
Hey there .

I am stuck on the above question. I can see how to get to 12000 N using P = F / A.

As it is 99960 = F / 0.12 and solve for F to get 11995.2.

But I don't understand the wording of the question as it says the pressure between a car tyre and the road is 99960N and the combined area of the tyres is 0.12m^2.

Should this say the combined pressure from all the tyres is 99960N?
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4 years ago
#2
(Original post by makin)
Hey there .

I am stuck on the above question. I can see how to get to 12000 N using P = F / A.

As it is 99960 = F / 0.12 and solve for F to get 11995.2.

But I don't understand the wording of the question as it says the pressure between a car tyre and the road is 99960N and the combined area of the tyres is 0.12m^2.

Should this say the combined pressure from all the tyres is 99960N?
Pressure is measured in Newtons per square metre, not just Newtons.

You could say the pressure exerted by each tyre is 999960 Nm^-2

It makes sense to talk about the combined area, but not about the combined pressure.

It's not the best worded question in the world, but seems par for the course for some online sites.
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