Does the smoothness of a surface affect the frictional force?

Yes

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No.

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Sometimes

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Can't say

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Solution

The correct option is A Yes
Friction is caused by the irregularities on the two surfaces in contact. Larger the irregularities, rougher is the surface and more the friction. Thus, the smoothness of the surface affects the frictional force.

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On one hand you say that when two smooth, even surfaces slide over each other, there is adhesion between them which causes friction. On the other you say that there is no friction between two smooth surfaces. I'm not getting.

Mark the word SMOOTH.

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Does the smoothness of a surface affect the frictional force?

The correct option is A YesFriction is caused by the irregularities on the two surfaces in contact. Larger the irregularities, rougher is the surface and more the friction. Thus, the smoothness of the surface affects the frictional force.

The correct option is A Yes
Friction is caused by the irregularities on the two surfaces in contact. Larger the irregularities, rougher is the surface and more the friction. Thus, the smoothness of the surface affects the frictional force.