Question

In how many ways we can minimize the friction

Answer 1

1)Friction can be reduced by making the surface smooth by polishing

The friction is due to the roughness of surface. If we make the surfaces smooth by polishing ,then friction will be reduced. For example a slide in the park is polished to make its surface smooth and reduce friction. Due to reduced friction of a polished ,smooth slide, children can slide down easily.

2)Friction can be reduced by applying lubricants (like oil or grease) to the rubbing surface

When oil or grease is applied between the moving parts of a machine ,a thin layer of oil or grease is formed between the two rubbing surfaces. This layer of oil separates the two rubbing surfaces a little bit due to which their interlocking is reduced to a large extent.This friction is reduced and movement becomes smooth.When oil or  grease is applied to the moving parts of a machine, then their surfaces do not rub directly against each other, they rub through a layer of oil and grease .

Answer 2

Answer:

By polishing the surface, as polishing makes the surface smooth and friction can be reduced. Using lubricants such as oil or grease can reduce the friction between the surfaces. When objects are rolled over the surface, the friction between the rolled object and surface can be reduced by using ball bearings.