Gravitational acceleration, g (m/s2)

Gravitational acceleration is controlled by performing the experiment in the same location until all the measurements are taken.

Length of the spring, L (m)

The length of the spring should be kept constant. This is controlled by using the same spring all along while checking to ascertain that it hasn’t undergone deformation by measuring its length every time before using.

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The spring constant, k (N/m)

The spring constant should be maintained and this is achieved by using a similar spring all along.