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[8]

The [[1]] force is caused by the irregularities of the surfaces in contact.


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Detailed Solution

The friction force is caused by irregularities on the surface in contact.
The interlocking of irregularities on the surfaces in contact causes friction. Rough surfaces have more irregularities, while smoother surfaces have fewer. As a result, rough surfaces provide more friction than smooth surfaces. Even seemingly smooth surfaces contain numerous minute irregularities.
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