Question

Factors affecting friction
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Answer 1

filling gaps and groves present in the surface reduces friction .

Answer 2

Answer:

smoothness of the contacting surfaces, a greater force being needed to move two surfaces past one another if they are rough than if they are smooth.

Surface on which the object is moved or the nature of the surface. i.e., rough surface, smooth surface, liquids etc.

The weight of the object or the amount of force on the surface by the object.

AND SOMETIMES WEIGHT ALSO