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Determination of the stiffness constant and effective mass of a spiral spring with the method of Simple Harmonic Motion(SHM)

Theory

Description
1 The spiral spring was suspended vertically from a rigid support.
2 Loads of 50, 100, 150, 200 and 250 were taken in lower end of spring and the extension ws measured in table-I.
3 Time for 10 oscillations were taken in table-II for each load added using stop watch.
4 The load was slightly displaced vertically to produce small oscillations.
5 The mean extension and mean time were calculated.
6 Grpah was drawn for table-I, loads in x-axis(10 small box = 50) and mean extension in y-axis(10 small boxes = 2), a straight line was drawn. Two points were take that in straight line precisely cuts through both axes.
7 Another graph for table-II, with load in x-axis(10 small boxes = 50) and meann time in y-axis(10 small boxes = 0.1). The straight line was drawn from x-axis point 26.5.
8 The mass was taken, along with a, from graph using formul.
9 Spring constant(k) was calculated.
10 Results were written, no errors.