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Stretching a spring

The stretching of a spring using 100g masses is a classic experimental demonstration of Hooke's law. This video features a close up of the experiment showing the stretching of a metal spring to a point beyond its elastic limit. The video allows measurements to be taken, from which the extension may be calculated and a graph plotted.
The main features of the video are:
  • Hooke's law
  • The spring constant
  • The elastic limit of a spring
  • Elastic and plastic behaviour.