1. C. Count the number of swings of the pendulum in 15 seconds, measure the length of the string and angle of the swing.
2. D. Place pendulum data into data tables and search for patterns in the data.
3. B. Based on the identified relationship between a pendulum’s frequency and length, predict the frequency for a new length.
4. A. Calculate ratios of frequency to length of a pendulum to see if there is a pattern so an equation can be written.