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At the bottom is a quick mspaint explaining what I mean the difference between traction and friction.
In Black: The wheel's treads
In Red: A surface such as carpet that can be molded by pressure
In Green: Points of frictional force application
As you will notice, the left picture has 2 posts, and the right picture has 8. When pressure force is applied, the carpet will mold into the treads.
The top pictures represent a "0-weight" situation, where the wheels are just barely touching the carpet, and where frictional force is applied. The center picture represents when weight is applied how the wheels will go "in to" the carpet. The points where the carpet is compressed is now in the treads. The bottom picture shows how there are more points of friction even after the pressure is applied.
This is how "Traction" is different from "Friction" Traction the friction across different planes.
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