Step through the video clip frame by frame. When the sphere is in front
of the scale at 12 cm, 11 cm, ..., 2 cm, and enter these time into an Excel
spreadsheet, as shown below.
(You can Play/Pause between readings, but make sure to hit Step Up or Step Down
before a reading to refresh the time.)
position (cm)
time (s)
12
11
10
9
8
7
6
5
4
3
2
Plot position (vertical axis) versus time (horizontal axis). Verify that the plot resembles a
straight line. This verifies that the sphere moves with constant,
terminal velocity. Find the speed of the sphere by adding a linear trendline. The magnitude of the slope of this trendline
is the speed of the sphere.