Question

write some methods to increase and decrease friction​

Answer 1

Answer:Grease is added between the moving parts in machines, to reduce friction. Another method of reducing friction is by using bearings. When ball bearings are introduced between two surfaces friction is reduced because of the freely rotating metal balls. To increase friction, the surfaces in contact have to be made rough.

Explanation:

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Answer 2

Answer:

oil or soil

Explanation:

oil 4 increase

soil 4 decrease