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Chapter 3: Problem 61

What holds up a car on its rubber tires? Most people would tell you that it is the air pressure inside the tires. However, the air pressure is the same all around the hub (inner wheel), and the air pressure inside the tire therefore pushes down from the top as much as it pushes up from below, having no net effect on the hub. Resolve this paradox by explaining where the force is that keeps the car off the ground.

Short Answer

Expert verified
The force that keeps the car off the ground is not just the air pressure inside the tires but also the structural support provided by the tire's material and design, which help distribute the car's weight evenly.

Step by step solution

01

Understand the Air Pressure Inside the Tires

Air pressure inside the tires is exerted equally in all directions within the tires, top, bottom, and sides. This means it pushes downward and upward with equal intensity.
02

Consider the Weight of the Car

A car's weight bears down on its tires, causing the bottom part of the tires to 'flatten'. This distortion creates a difference in the air pressure inside the tires.
03

Resolve the Paradox

Since the bottom of the tire is in direct contact with the ground (due to the car's weight), the air pressure at the bottom is transferred to the ground, whereas the air pressure at the top acts on the tire's inner surface freely. Therefore, the force that holds up the car isn't just the air pressure, but the combination of this air pressure and the structural support from the tires' material and design.

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