The force on a spring can be found by measuring the distance the spring changes from its original length, according to ______.

• A. Newton's law
• B. Hooke's Law
• C. Ohm's law
• D. Bernoulli's principle

Answer: (B)

Hooke's Law says the force a spring exerts is proportional to how far its length has changed from its rest length. Mathematically, F = -k x, where k is the spring constant and x is the displacement. The magnitude of the force is F = k|x| and the direction is opposite to the displacement, meaning the spring resists being stretched or compressed. So by measuring how much the spring stretches or compresses, you can determine the force acting on it (assuming you know k). This specific relationship is what ties displacement directly to force for springs, unlike Newton's law in general motion, Ohm's law for electrical circuits, or Bernoulli's principle for fluid flow.