Conceptual:

To observe simple harmonic motion

Experimental:

to measure the force as a function of displacement for a spring and find the spring constar
to measure the amplitude of simple harmonic motion
to measure the period of simple harmonic motion
to see the effect of the mass of the object on the period of oscillation
to measure the spring constant dynamically.

Q 1. Why should the period increase when the mass that is moving increases?

Q2. Why should a spring that is stretched greatly by a given mass produce slower oscillations (longer period) that a spring that is only stretched a little bit?