Hooke's law states that under normal conditions:
Correct answer: B. Stress is directly proportional to strain till elastic limit
- A. Stress is inversely proportional to strain till elastic limit
- B. Stress is directly proportional to strain till elastic limit
- C. Stress is independent of strain
- D. Stress is proportional to elastic modulus
Explanation
Hooke's law is a principle in physics that relates to the elasticity of materials. It states that, under normal conditions, the stress applied to a solid material is directly proportional to the strain that results as long as the material remains within its elastic limit. This means that the amount of deformation or stretching of the material is directly proportional to the force applied until a point is reached where the material can no longer return to its original shape and permanent deformation occurs. The constant of proportionality between stress and strain is called the modulus of elasticity or Young's modulus.
This question appeared on the NUMS 2019 (cancelled sitting) paper, which you can sit online with every answer explained.
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About Simple Harmonic Motion
Simple harmonic motion is oscillation in which acceleration is directly proportional to displacement and directed toward the equilibrium position. Work includes displacement, velocity, acceleration, phase, period, frequency, amplitude and energy, with applications to springs and simple pendulums. The restoring force and the conditions for SHM distinguish it from general periodic motion.
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