The force of friction which is introduced when there is no relative motion between the surfaces in contact is called ____________?

Option 1 -> Static friction acts when surfaces are in contact but not moving relative to each other.

Option 2 -> Kinetic friction acts when surfaces are sliding or moving relative to each other.

Option 3 -> Centripetal force is directed toward the center of circular motion, not a friction type.

Option 4 -> Centrifugal force is an apparent outward force in rotating systems, not a friction type.

Hence, Option 1: Static Friction -> This is the resistive force that prevents surfaces from sliding past each other when they are at rest relative to one another. It must be overcome to initiate motion. -> correct