Measure properties of an elastic cord

Investigate the properties of an elastic cord as it supports different amounts of weight.

1. Set things up so that a piece of cord of initial length L_o is hanging freely from a rod. Make the initial length at least 40 cm. Measure the diameter of the cord using calipers.
2. Hang at least six different masses in the range 300 g to 700 g from the cord. For each mass, measure the amount Δ L by which the cord stretches.
3. Make a neat table with your results.