s on Doing and Reporting Labs in General: Read about doing labs in general in "Introduction to Physics Lab" in the Lab Information module. Read about the lab report format, also in in Lab Information module. Print or copy the data table for the lab before starting the lab. This is available in the same page as the Lab Instructions. An excel version of this data table is also available. Take all measurements and write results in the table. Then when you do the report, you can copy the information into it For This Lab: Objective: To find the spring constants for three springs, and to predict the period of several mass-spring systems. Materials: the timer of a cell phone, or another timer. Theory: Hooke's Law can written as Fs = -kx, where Fs is the force by the spring when it is stretched or compressed. The negative sign indicates that this is a restoring force, always in a direction opposite the displacement x. The spring constant k of a spring is a number that tells us how stiff or strong a spring is; in other words, how much force is required to stretch it by a certain distance. The