Spring Constant Measurement
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It is well known that within a certain limit, springs extend linearly with force applied. By adding known masses m to a spring, and measuring displacement y, its force constant,k is calculated using this law
$$F=-ky$$
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Also, by measuring the Time period T for different masses, k can be found out.
$$T=2π\sqrt{\frac{m}{k}}$$
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When two springs are attached together in series, they act as one single harmonic system, having a certain resultant force constant. This combined force constant is found out using same methods as mentioned above.
$$\frac{1}{k_{eq}} = \frac{1}{k_1}+ \frac{1}{k_2}$$