Question

How can we increase or reduce friction?

Answer 1

Friction or Frictional force can be reduced by making the surface of an object smooth. This reduces the interlocking capability of the two objects .
In the same way, frictional force can be increased by making the surface rough . In this case ,the two objects gets much space to interlock , thus increasing the friction .



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Answer 2

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Methods of increasing friction:-

1) By making the surface rough.

2)By removing all the lubricants.

3)By increasing the mass of the body

Methods of decreasing friction:-

1)By using lubricants.

2)By making the body streamlined

3)By using ball bearings.