Question

How can it be so hard to drag rubber across smooth glass if friction is caused by surface roughness?

Answer 1

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ȯ These weak bonds cause the two objects with surfaces touching to be attracted making it hard to slide one object along the other.

${\texttt{Additionally}}$ the sliding motion can generate vibrations (phonons) in the objects touching, which takes energy away from the sliding motion and therefore slows down the objects.

Because friction is mainly caused by electrical attraction and not surface roughness, smooth objects can still have relatively high friction coefficients.

${\texttt{Fact}}$ nanoscopically smooth objects experience very high friction (as long as their chemical structure promotes significant electromagnetic forces) because they have much more of their surface in contact.



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Answer 2

HEYA! !
ANSWER - : ✔ ✔

Friction is not caused mainly by surface roughness. ... Persson, friction is caused by weak electromagnetic forces between molecules, such as experienced in hydrogen bonds and Van der Waal bonds.

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