To perform the static deflection test, hang different masses from the spring and measure the spring deflection at equilibrium. Then graph the spring deflection versus mass. Find the line through the origin that is the best fit to the data.
What force stretches the spring?
The best fit line in the graph represents a linear
relationship between this force and the displacement.
This agrees
with Hooke's Law F=kx.
What is the expression for k?
In this case what value do we get for k?