During this lab students will change three variables on the pendulum- length of string, angle of release, and mass of the bob. They will test and understand the relationship between the variable being tested and the period. Materials needed for each group: Ring stand (or some way to hang the pendulum), string, hanging masses (or a cup full of pennies, marbles, etc), stopwatch, and a protractor. Included are 2 versions of this lab:1. IN PERSON VERSION: This inquiry version in class takes 2 class