A truck tire is inflated on a cold morning. Throughout the day, the tire heats up due to rising outdoor temperatures and friction with the road. Will the pressure inside the tire increase or decrease?
Question
A truck tire is inflated on a cold morning. Throughout the day, the tire heats up due to rising outdoor temperatures and friction with the road. Will the pressure inside the tire increase or decrease?
Solution
The pressure inside the tire will increase. Here's why:
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The air inside the tire is made up of molecules that are constantly in motion. When the tire is inflated on a cold morning, these molecules are moving relatively slowly due to the low temperature.
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As the tire heats up throughout the day, the air molecules inside the tire start moving faster. This is because heat energy is being transferred to the air molecules, increasing their kinetic energy.
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The faster the air molecules move, the more frequently they hit the inside walls of the tire. Each time an air molecule hits the wall, it exerts a force on it.
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The pressure inside the tire is the result of these forces being exerted on the inside walls of the tire by the air molecules. So, as the air molecules move faster and hit the walls more frequently, the pressure inside the tire increases.
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Therefore, as the tire heats up due to rising outdoor temperatures and friction with the road, the pressure inside the tire will increase.
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