Historically, replacing dirt roads with paved roadsreduced
Chapter 9, Problem 70(choose chapter or problem)
Historically, replacing dirt roads with paved roadsreduced rolling friction between vehicles and the surfaceof the road. Replacing paved roads with steel railsreduced friction further. What will be the next step inreducing friction between vehicles and the surfaces overwhich they move? What friction will remain after surfacefriction has been eliminated?
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