Question

What causes friction?

• A. Irregularities on the two surfaces in contact
• B. Color of the surfaces
• C. Gravitational attraction between the surfaces
• D. Atmosphere around the surfaces
• E. smoothness on the two surfaces in contact

Answer 1

The correct option is A

Irregularities on the two surfaces in contact

Friction is caused by the irregularities on the surfaces in contact. Even smooth surfaces have numerous minute irregularities that interlock, and a force has to be applied to overcome this.