A simple pendulum consisting of an iron ball suspended from a string is used in an experiment to verify the dependence of the period on the length of the string. The pendulum is pulled back about and released. The time for the pendulum to swing back and forth is measured. The procedure is then repeated for different lengths of string. Which of the following is a modification that will improve the students’ ability to test the dependence of the period on the length of the string and explains why?
