Question

friction can be altered by changing dash of the surfaces​

Answer 1

Answer:

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

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

3)Friction can be reduced by using wheels to move objects.

4)Friction can be reduced by using ball bearing between the moving parts of machine.

Explanation:

Hope it helps you.....