What happens to the irregularities of the two surfaces which causes static friction?

Correct option is D

The correct answer is (d) Interlocking.
· Interlocking occurs when the irregularities of two surfaces come into contact and catch onto each other, causing resistance to motion. This resistance is what we perceive as static friction. Static friction must be overcome for one surface to start moving over the other.
Information Booster:
Sliding:
· Sliding occurs when the object overcomes static friction and begins to move. The friction encountered during this motion is called kinetic friction.
Vanishing:
· Vanishing does not describe the process related to friction. The irregularities do not vanish but rather interlock to create friction.
Rolling:
· Rolling friction occurs when an object rolls over a surface, which is different from static friction. Rolling friction is usually less than static and sliding friction.