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what is the Friction?
Friction is the irregularities on the two surfaces/things in contact of each other.
The force of friction is dependent on the irregularities of the surface if it is greater then the friction will be greater and if it is smootj then the friction will be lesser.
If the two surfaces incontact are pressed harder, then the force of friction will increase.
•Lubricants
Applied between the moving part of a machine
•Rolling Friction
•Drag