

A CameraScope Physics Example
Measuring the velocity of a falling object using digital video is a valuable activity that helps students to understand this highly abstract concept in a very concrete way. Using an inexpensive webcam, students record the dropping a ball from 2 meters against the backdrop of a meter stick for subsequent realworld calibration.
The height of the ball is measured at each frame of the movie (.033 second increments). The resulting data file is brought into Excel and graphed. with trendline analysis showing a nearperfect (r^{2} > .99) fit to the theoretically expected velocity curve (a second order polynomial). The force of gravity can then be calculated easily to a high degree of accuracy when compared to the theoretical 9.8 meters/second^{2}.