Question

friction can reduced by ​

Answer 1

Answer:

There are several ways to reduce friction: The use of bearing surfaces that are themselves sacrificial, such as low shear materials, of which lead/copper journal bearings are an example. Replace sliding friction with rolling element friction, such as with the use of rolling element bearings

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Answer 2

Answer:

By polishing the surface, as polishing makes the surface smooth and friction can be reduced.