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The static frictional force is

1. self adjustable.
2. not self adjustable.
3. scalar quantity.
4. equal to the limiting force.

Correct answer: self adjustable.

Solution

Static friction is called self-adjustable because it varies in magnitude to oppose the applied force as needed, until it reaches its maximum value. It is not always equal to the limiting friction; that only happens at the threshold of motion.

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