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2-D Collision of Pucks -- Center of Mass Velocity
written by Aaron Titus
This lab uses Tracker video analysis software to measure and analyze the center of mass of a system of two pucks during a two-dimensional collision. Students measure the initial and final velocity vector for each puck and calculate the center-of-mass velocity of the system before and after the collision and show that it is constant. Tracker can automatically calculate and mark the center of mass in each frame, so it is easy to see that the center of mass velocity is constant and calculate its value from graphs of center-of-mass variables.

The zip file contains the lab handout, a video showing a 2-D collision of pucks, and the Tracker file. The video copyright is Flashmedia.

To open the Tracker file, download and run Tracker from http://www.cabrillo.edu/~dbrown/tracker/. Tracker is free.

The videos can be used with other video analysis software; however, the handout has screen captures from Tracker and instructions specifically written for Tracker.
2 supplemental documents are available
Subjects Levels Resource Types
Classical Mechanics
- Linear Momentum
= Collisions in Two Dimensions
- Motion in Two Dimensions
= 2D Velocity
= Center of Mass
Education Practices
- Active Learning
= Modeling
- Middle School
- High School
- Instructional Material
= Activity
= Laboratory
= Tutorial
- Audio/Visual
= Movie/Animation
Intended Users Formats Ratings
- Learners
- Educators
- application/pdf
- application/zip
- video/quicktime
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Access Rights:
Free access
This material is released under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 license.
Rights Holder:
Aaron Titus
Keywords:
center of mass, collision, tracker, video analysis, video lab
Record Cloner:
Metadata instance created January 9, 2011 by Aaron Titus
Record Updated:
February 6, 2023 by Wolfgang Christian
Last Update
when Cataloged:
January 9, 2011
Other Collections:

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AIP Format
A. Titus, Computer Program 2-D COLLISION OF PUCKS -- CENTER OF MASS VELOCITY (2011), WWW Document, (https://www.compadre.org/Repository/document/ServeFile.cfm?ID=10579&DocID=2072).
AJP/PRST-PER
A. Titus, Computer Program 2-D COLLISION OF PUCKS -- CENTER OF MASS VELOCITY (2011), <https://www.compadre.org/Repository/document/ServeFile.cfm?ID=10579&DocID=2072>.
APA Format
Titus, A. (2011). 2-D Collision of Pucks -- Center of Mass Velocity [Computer software]. Retrieved March 28, 2023, from https://www.compadre.org/Repository/document/ServeFile.cfm?ID=10579&DocID=2072
Chicago Format
Titus, Aaron. "2-D Collision of Pucks -- Center of Mass Velocity." https://www.compadre.org/Repository/document/ServeFile.cfm?ID=10579&DocID=2072 (accessed 28 March 2023).
MLA Format
Titus, Aaron. 2-D Collision of Pucks -- Center of Mass Velocity. Computer software. 2011. 28 Mar. 2023 <https://www.compadre.org/Repository/document/ServeFile.cfm?ID=10579&DocID=2072>.
BibTeX Export Format
@misc{ Author = "Aaron Titus", Title = {2-D Collision of Pucks -- Center of Mass Velocity}, Month = {January}, Year = {2011} }
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%A Aaron Titus %T 2-D Collision of Pucks -- Center of Mass Velocity %D January 9, 2011 %U https://www.compadre.org/Repository/document/ServeFile.cfm?ID=10579&DocID=2072 %O application/pdf

EndNote Export Format

%0 Computer Program %A Titus, Aaron %D January 9, 2011 %T 2-D Collision of Pucks -- Center of Mass Velocity %8 January 9, 2011 %U https://www.compadre.org/Repository/document/ServeFile.cfm?ID=10579&DocID=2072

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