## Analysis of video data

The sequence of 16 video frames is shown below right after a student has placed dots on the computer screen for each position of the cross marks of both cars' motion.

Below that is a graph showing the velocity of each car as a function of time. In the better computer data processing programs, the student has to instruct the computer in the algebra of calculating the velocity from position coordinates.

Students view the sequence one frame at a time on the computer screen.

Students mark the location of the cross on each railway car using the cursor; a dot appears on the screen.

The computer records the coordinates of the dot on the screen.

The numbers recorded in this way form the data base from which students can instruct the computer to calculate such derived results as velocity, acceleration, momentum, etc. (velocity shown graphed above)

On to *Video Camera* Specifications and *Computer software* for processing video data

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