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Answer -B) decreases
If we apply oil to the door hinges, the friction will decrease because lubrication always decreases friction between two surfaces; hence, applying oil will decrease the friction.
Friction Force
Friction resists motion when the surface of two objects comes into contact with each other. The force that reduces the mechanical advantage of a machine or decreases the output to input ratio is known as friction Force.
Similarly, due to the wear and tear of door hinges in houses, it starts to make creaking sounds, for which we apply oil to the hinges for smooth functioning of doors.
