Measuring extension

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Investigating Extension

Set up a spring (or other object to be tested), so that it is supported by a clamp.

Measure its original length with a ruler.

Add weights one at a time to the bottom of the object.

Measure the new length after each weight is added and calculate the extension.

Plot a graph of force (weight) against extension for your results.

Where the line of best fit is straight, it obeys Hooke's law. If loaded beyond its limit of proportionality, the graph will begin to curve.

Safety:

Stand up so you can get out of the way quickly if the weights fall.

Wear safety goggles to protect your eyes if the object snaps.