1. In the periodic motion lab, you measured the effect of mass, length, and angle on the period of a pendulum. To measure the effect of one of these variables, the other two were held constant. Briefly explain why. 2. To determine which variables affected the period, you compared results for small, medium, and large values of the variable you were testing. When taking data, you were asked to average three measurements each for the small, medium, and large values. What is one possible reason you were asked to average three values instead of two