Why doesn't tire pressure vary with vehicle payload (much)?
January 20, 2010 11:45 PM Subscribe
Stupid physics question: tire pressure.
posted by ctmf to Science & Nature (33 answers total) 3 users marked this as a favorite
Let's say your truck has 4 tires, and they're all pressurized with air to some pressure, say 30 psig. Now say you put an additional 1000 lbs in the truck. Assume for round number's sake, the tire contact area with the ground is 10 square inches.
Why would the tire pressure not go up by (1000 lbs / 4 tires) / 10 in^2 = 25 lbs?
Put another way, does dividing my car weight by the tire pressure give the total tire contact area with the road?
Not homework, I just thought of this filling my car with gas this evening and it's bugging me.