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In our physics lab, we did a experiment regarding Hooke's law, and the goal is to...

In our physics lab, we did a experiment regarding Hooke's law, and the goal is to find the spring constant by using a simulation. In the first section of the procedure, our instructor intentionally give us the wrong instruction, which tells us to find spring constant using varying mass, delta x and constant gravity. In the second section of the procedure, we need to figure out what went wrong in the first section that caused us to incorrectly measure the spring constant? The hint we are given is to find the spring constant by varying the gravity at fixed mass. Many thanks!

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