Describe an experiment to determine the acceleration due to gravity, g, using a spiral spring, of known constant. 

• Clamp the spring on a retort stand
• Fix a horizontal pin at free end of the spring to act as a pointer.
• Place a vertical meter rule next the pointer and note the initial pointer position, P₁.
• Suspend a known mass, M, to the free end of the spring, note and record the new position of the pointer, P₂.
• Calculate extension, e = P₂ – P₁.
• Find the extensions for different masses
• Plot a graph of e against M
• Calculate the slope, S of the graph
• Calculate the acceleration due to gravity, g = kS (k = force constant)

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