For the lab I have to find the spring constant and how force relates to time with simple harmonic motion. To find the spring constant, I used hooke's law and compared different added masses to the stretch from the equilibrium position. When I graphed that, the slope was the spring constant since F= K*X. Using logger lite, I added a one kg mass to the spring I was using and made it oscillate. The vernier quest and the logger lite program produced a Force vs. Time graph. I need to create a theoretical Force vs. time graph (using the time intervals) and manipulate it so that one of the parameters is the spring constant. i will then proceed to compare that to the spring constant found at the beginning. I am having trouble figuring out how to manipulate the equations. What is the force? I thought it was the weight but that doesn't make sense because the force is changing with each oscillation anywhere between 5 and 13 N. I know that the period is equal to 2pi* sqrt(k/m) but I just don't understand what the force is and how to relate it.