Activity $2-3$: Analyzing the Digital Video to Find Distances and Forces

Open the experiment file Coulomb's Law $($L$01$A$2-3).$ This will open a movie in the video analysis software.

Record the mass of the hanging ball and the vertical distance, $L,$ from the point of suspension to the center of the ball. This information is given in the movie, usually on the first frame.

m

L:

Use the video analysis software to analyze the video frames by recording:

$($a$)$ the position of the suspended charged ball and $($b$)$ the position of the prod ball in each frame of the video.

Your measurements need to be converted to meters. If your video analysis software is not set up to do this automatically, figure out how to do it$.$

Set up calculated columns in the video analysis software or a spreadsheet to calculate the Coulomb force $F_e$ from your data for $x_{\text{b}\text{a}\text{l}\text{l}},$ and also to calculate $r,$ the distance between the suspended ball and the prod ball from your data for $x_{\text{b}\text{a}\text{l}\text{l}}$ and $x_{\text{p}\text{r}\text{o}\text{d}-}$