A very inexpensive lab that uses 3 formulas to find the value of "g" in the lab, predict the period of a pendulum of known string length, and predict the length of a pendulum of known period. Students get great hands-on experience with fascinating pendulums. The lab is super easy to set-up and run, and there are good questions to stimulate thinking on the part of students! Great lab, great questions, and teacher notes and answers included! Can't beat this deal!