Stretching

• What is the difference between an elastic and an in elastic deformation?

  Elastic: reversible deformation. Inelastic: irreversible deformation.
• What is the limit of proportionality?

  The limit of proportionality is the point at which the relationship between two variables is no longer direct
• Describe an experiment you could do to investigate the relationship between force and extension?

  Hooke's Law experiment

  • fixed ruler attached to a spring
  • hang a mass on it and record distance
  • apply extra masses and repeat step 2
  • repeat step 3
  • draw graph
  • if it’s straight then it’s directly proportional
• How do you find the following from a linear force-extension graph?

  a.) spring constant

  b.) work done

  A.) gradient of straight line

  b.)Elastic potential = 0.5 x spring constant x extension^2 or
• Give the equation for elastic potential energy

  Elastic potential = 0.5 x spring constant x extension^2