Question

how can we minimise friction

Answer 1

Friction is reduced by adopting the following methods:
1. By polishing the surfaces.
2. By applying oil or grease on the surfaces ( or by lubrication).
3. By sprinkling a soft, slippery fine powder on the surfaces as we do on our carom board.
4. By using wheels, ball-bearings or roller-bearings in machines.
5. By streamlining the body of an object like those of aeroplanes, rockets, ships, etc. Birds and fish also have streamlined bodies.