Question

Consider the following statements:

Statement 1: Friction is caused due to interlocking of irregularities present on the surfaces in contact.
Statement 2: Frictional force increases if the two surfaces are pressed harder.

Which of these statements is/are correct?

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

Answer 1

The correct option is C

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. For example, one can easily drag a mat when nobody is sitting on it. However, dragging the same mat becomes quite difficult when a person is sitting on it. Thus, both the statements are correct.