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Hooke’s Law and Young’s Modulus Revision
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Hooke’s Law and Young’s Modulus Revision

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Transcript

  • 1. Hooke’s Law and Young’s Modulus Revision
  • 2. Define these terms:• Stress• Strain• Extension• Length• Compression• Tension
  • 3. Hooke’s LawThis is theforce applied This is the(N) extension (m)
  • 4. We can write it another way This is the This is the extension ofThis is the gradient (N/m)force applied the spring and is unique (m)(N) for each spring
  • 5. Young’s Modulus
  • 6. Elastic Movement in MetalsAtoms are stacked in planes as +ve ions in a sea of-ve free electrons.When stress is applied to the metal, the +ve ionswill start to spread apart.The atomic bonds stretch, and the attractive forcesbetween the atoms will oppose the applied stress,like millions of tiny springs.If the metal has not yielded, the interatomic forceswill pull the metal back into its original shape whenthe stress is removed.
  • 7. Elastic Movement in Metals