Use a graphing program to plot Time (AKA Period, in seconds) versus Length. Typically, the dependent variable is on the y-axis and the independent variable is on the x-axis.
You may use any graphing program you like. Excel works well, though it will not graph curves. There are online graphing programs. My favorite is Logger Pro, which we have a site license for. Download it here:
https://parkscience.pbworks.com/w/page/351271/LoggerPro
The password is technology
Create a graph and attempt to make some mathematical sense out of it. Is there an equation that might be relevant to relate time/period and length? What would it resemble? If you come up with a tentative answer/theory, check it by looking online for an equation: period of simple pendulum equation.
Good luck! Bring graphs and ideas to class next day.
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