What are some of the most common examples of helpful friction?
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Friction is defined as the resistance provided by surfaces in contact as they move past one another.
Factors affecting friction:
On the nature of the two surfaces that are in contact: The smoothness or roughness of the two surfaces in contact with each other determines friction. Because there is less interlocking of irregularities when the surface is smooth, friction between the two is reduced. Friction rises when the surface is rough.
On the force that is acting on these surfaces: When a force is applied alongside irregularities, friction increases.