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  1. Friction can be reduced by changing from

    2. A.

     Static to Dynamic
    B.

     Rolling to Sliding
    C.

     Dynamic to Static
    D.

     Sliding to Rolling

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    Answer : Option D

    Explanation :

    Friction can be reduced by changing from sliding to rolling. Replace sliding friction with rolling element friction, such as with the use of rolling element bearings.

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