Question

Consider the following statements:

Statement 1: Friction is caused due to interlocking of irregularities present on the surfaces in contact.

Statement 2: Rough surfaces generally have more friction between them.

Which of these statement(s) is correct?

• A. Neither of the statements is correct.
• B. Both the statements are correct.
• C. Only statement 1 is correct.
• D. Only statement 2 is correct.

Answer 1

The correct option is B

Both the statements are correct.

Friction is caused by the interlocking of irregularities present on the surfaces in contact. Rough surfaces have a large number of irregularities and generally have more friction.

This frictional force increases if the two surfaces are pressed harder. Even surfaces which appear smooth have a large number of minute irregularities present on them. These irregularities lock into one another. ​Thus, both the statements are correct.