Question

Consider the following statements:

Statement 1: The friction is caused by the interlocking of irregularities in the two surfaces.
Statement 2: The force of friction will increase if the two surfaces are pressed harder.

Choose the correct option:

• A. Contact force
• B. Muscular force
• C. Non contact force
• D. Electrostatic force

Answer 1

The correct option is C

Non contact force

We see that friction is caused by the interlocking of irregularities in the two surfaces. It is obvious that the force of friction will increase if the two surfaces are pressed harder. You can experience it by dragging a mat when nobody is sitting on it, and when a person is sitting on it. Thus, both the statements are correct.