Question

The depressions and elevations present on the surface of objects causes friction.

• A. True
• B. False
• C. Ambiguous
• D. Data insufficient

Answer 1

Answer: (A)

True

At the atomic level every surface will have depressions and elevations. When one surface is in contact with one another, the elevations in one surface will set into depressions in the other. The interlocking of two surfaces opposes or hinders or resists the relative motion between the two surface . This resisting force which acts in the opposite direction of the movement is called force of friction. Hence the depressions and elevations present on the surface of objects causes friction.