Hook's law correlates the:
Correct answer: D. Stress and strain
- A. Force and displacement
- B. Force and extension
- C. Force and compression
- D. Stress and strain
Explanation
Hooke's Law is a principle of physics that states the strain in a solid is proportional to the applied stress within the elastic limit of that material. Mathematically, it can be expressed as Stress/Strain = Constant. This means that the material will return to its original shape after the stress is removed, as long as the elastic limit is not surpassed. The other options mention relationships that are not the fundamental focus of Hooke's Law. While force can influence displacement, extension, and compression, Hooke's Law specifically addresses the proportional relationship between stress and strain.
This question appeared on the ETEA MDCAT 2012 paper, which you can sit online with every answer explained.
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About Young's Modulus and Stress-Strain
Stress and strain describe how a solid deforms under an applied force, while Young's modulus is the ratio of tensile stress to tensile strain within the elastic limit. The topic includes elastic and plastic behaviour, Hooke's law, the stress strain graph and the difference between stiffness, strength and breaking stress.
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