Elasticity

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Elasticity

  1. 1. Elasticity
  2. 2. Objectives • Elasticity • Hooke’s Law • Stress • Strain • Young modulus
  3. 3. • Elasticity : • is a property of object to deform when a force is applied and to return it’s original shape when the deforming force is removed, • e.g. rubber band, spring • Plastic Deformation • when the deforming force is removed, the object doesn’t return to it’s original shape • e.g. Plastine, Blu-tack
  4. 4. • Hooke’s law: ‘The extension of a body is proportional to the force causing it provided that the limit of proportionality is not exceeded’ Extension: when a force is applied it changes the length of the object the change in length is called extension Limit of proportionality : The greatest force that can be applied to an elastic body without ca using permanent deformation.
  5. 5. • Force (y axis) • Extension (x axis)
  6. 6. • Stress: is a quantity that is proportional to the force causing a deformation. Stress is the external force acting on an object per unit cross sectional area. Stress is the load per unit cross-sectional area of the material Stress (Nm-2) = force (N) cross-sectional area (m2)
  7. 7. • Strain: is the ratio of extension to original length. Strain = extension (m) original length (m) There isn’t any unit of strain.
  8. 8. • Young modulus : the ratio of stress to strain. Young Modulus (Nm-2) = stress strain or E = stress strain
  9. 9. Questions….
  10. 10. Thanks……

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