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Question

Consider the following statements:

Statement 1: Rough surfaces generally have more friction between them.
Statement 2: When we attempt to slide one surface over another, we have to apply a force to overcome interlocking between the irregularities present on the surfaces.

Choose the correct option.


A

Statement 1 is correct but statement 2 is incorrect.

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B

Statement 1 is incorrect but statement 2 is correct.

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C
Both the statements are correct.
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D
Both the statements are incorrect.
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Solution

The correct option is C Both the statements are correct.

Friction is caused by interlocking of irregularities present on the surfaces in contact. Even surfaces which appear smooth have a large number of minute irregularities present on them. These irregularities lock into one another. When we attempt to slide any surface over another, we have to apply a force to overcome the interlocking between them.
Rough surfaces have more interlocking as they have more number of irregularities present on the them. Hence, friction is generally larger between them. ​Thus, both the statements are correct.


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