Question

new techniques to reduce friction

Answer 1

by putting lubricants,using ball bearings, polishing surface etc

Answer 2

1.Polishing

Polishing the surface, reduces the irregularities and hence, reduces friction.


2.Streamlining
Fast cars, boats, planes etc., have a streamlined body. This is to allow air (or water in the case of boats) to easily flow by, without offering much resistance.

Hope it helps