Elasticity: Hooke's Law and Young's Modulus
Physics · 50 practice questions
Elastic limit, yield point, breaking point; Hooke's law and Young's modulus; the spring balance as a device for measuring force; work done per unit volume in springs and elastic strings.
- Interpret force-extension curves and Hooke's law/Young's modulus of a material.
- Use a spring balance to measure force.
- Determine the work done in springs and elastic strings.
Try a few questions
- Practice question 1
Beyond the elastic limit, a material undergoes
- A.only temporary, fully reversible deformation
- B.permanent (plastic) deformation and does not return to its original length
- C.no deformation of any kind, regardless of the applied force
- D.an immediate and complete fracture
Show the answer
B. permanent (plastic) deformation and does not return to its original length
Exceeding the elastic limit means the material stays deformed even after the applied force is removed.
- Practice question 2
Elastic deformation is fully and immediately reversible once the applied force is removed, unlike
- A.the material's own Young's modulus, which never changes
- B.plastic deformation, which is permanent
- C.the material's own density, which changes only under elastic deformation
- D.stress, which cannot be reversed under any circumstances
Show the answer
B. plastic deformation, which is permanent
This complete reversibility is exactly what distinguishes elastic deformation from the permanent nature of plastic deformation.
- Practice question 3
The elastic limit of a material is the maximum stress that can be applied to it such that it will still
- A.return to its original shape once the force is removed
- B.undergo permanent, irreversible plastic deformation
- C.fracture completely under the applied load
- D.expand indefinitely without ever returning to its original shape
Show the answer
A. return to its original shape once the force is removed
Staying within the elastic limit ensures the material's deformation is fully reversible once the force is removed.
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