Question

how we can increase friction​

Answer 1

friction decreases with smoothness only to a degree; friction actually increases between two extremely smooth surfaces because of increased attractive electrostatic forces between their atoms.

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.