Question

how can friction between two surfaces be reduced?

Answer 1

Friction between the two surfaces be reduced by:-
(i) Polishing the surfaces
(ii) Lubrication - By using lubricating oil on the surfaces
(iii) Ball bearing - By using ball bearing between the parts of the machines or surfaces
(iv) By making the Streamline shape of the object to reduce fluid friction.

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Answer 2

1. by polishing the surfaces
2. by applying oil or grease on the surface (or by lubrication)
3. by sprinkling a soft, slippery fine powder on the surfaces
4. by streamlining the body of an object
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