Question

methods of increasing and dicreasing of friction​

Answer 1

Explanation:

Method of decreasing and increasing friction

By polishing: Friction between two surfaces can be reduced by polishing them. ...

Ball-bearing: As the rolling friction less than the sliding friction consequently in rotating machinery, the shafts are fixed on the ball bearing so that the friction can be reduced considerably.

Answer 2

Answer:

friction is a surface phenomenon...i.e to increase the friction u have to increase the surface roughness ..it can be done by removing some mass from the surface..

to decrease friction u have to decrease surface roughness...this can be done by oiling ,greasing, or by polishing the surface...

thanks, hope it helps