Question

Why friction is a self adjusting force?

Answer 1

Friction is self adjusting because it does not have displacement nor magnitude, it only depends on and opposes an applied force.

Answer 2

Answer:

Static friction is recognised as a self-adjusting force because it wants the objects to remain at rest not move. Hence, if an external force is applied, the static friction force will be equal to the magnitude of the external force, until it surpasses the threshold of motion.