The Tracker Video Analysis and Modeling Tool allows students to model and analyze the motion of objects in videos. By overlaying simple dynamical models directly onto videos, students may see how well a model matches the real world. Interference patterns and spectra can also be analyzed with Tracker.

Tracker 4.96 installers are available on Linux, Mac OS X, and Windows and include the Xuggle open source video engine.

Tracker is an Open Source Physics tool built on the OSP code library. Additional Tracker resources, demonstration experiments, and videos, can be found by searching ComPADRE for "Tracker."

Additional Tracker resources including Tracker help and sample videos are available from the Tracker home page at Cabrillo College below.

Please note that this resource requires
at least version 1.6 of
Java (JRE).

Author: Eran Grinvald
Posted: October 27, 2014 at 5:33AM
Source: The Open Source Physics collection

I'm a physics teacher in highschool Israel and a part time researcher in the Weizmann Institure of Science. I'm new to tracker and think it is a fantastic tool and very excited about it.

I have two students which are frustrated that they can't reproduce the estimated acceleration calculated in tracker from the raw data (x,y,t) themselves, while they reproduce perfectly the velocities. I tried several algorithims I could think of to calculate the acceleration, all give quite different results, which means that for the specific object we tracked the time interval of the video is not short enough for numerical convergence. Yet non of the algorithims I tried did not reproduce the tracker result.

I could not find anywhere how tracker calculates the x (y) acceleration at a specific time, this without looking at the code itself.

Can anybody tell me what is the formula to calculate the acelleration in the x direction of point N (The first point that tracker calculates for is N=3, as a function of the data set x(i) and t(i) I think the standard algorithim for numerical second order integration can calculate for N=2 as well.)

> On Oct 27, 2014, Eran Grinvald posted: > > I'm a physics > teacher in highschool Israel and a part time researcher > in the Weizmann Institure of Science. I'm new to tracker > and think it is a fantastic tool and very excited > about it. > > I have two students which are frustrated > that they can't reproduce the estimated acceleration > calculated in tracker from the raw data (x,y,t) themselves, > while they reproduce perfectly the velocities. I tried > several algorithims I could think of to calculate > the acceleration, all give quite different results, > which means that for the specific object we tracked > the time interval of the video is not short enough > for numerical convergence. Yet non of the algorithims > I tried did not reproduce the tracker result. > > I could > not find anywhere how tracker calculates the x (y) > acceleration at a specific time, this without looking > at the code itself. > > Can anybody tell me what is the > formula to calculate the acelleration in the x direction > of point N (The first point that tracker calculates > for is N=3, as a function of the data set x(i) and > t(i) I think the standard algorithim for numerical > second order integration can calculate for N=2 as well. > > > Thanks in advance, > > Eran

Author: andrew rowney
Posted: January 24, 2014 at 6:18AM
Source: The Open Source Physics collection

Hi Guys.. i am tearing my hair out to get a motion analysis program which can give 9.8 m/s2 for a falling ball????? tracker gives about double that value ..can anyone help thanks andrew

Brown, D. (2017). Tracker Video Analysis and Modeling Tool (Version 4.96) [Computer software]. Retrieved February 21, 2017, from http://physlets.org/tracker/

%0 Computer Program %A Brown, Douglas %D February 7, 2017 %T Tracker Video Analysis and Modeling Tool %7 4.96 %8 February 7, 2017 %U http://physlets.org/tracker/

Disclaimer: ComPADRE offers citation styles as a guide only. We cannot offer interpretations about citations as this is an automated procedure. Please refer to the style manuals in the Citation Source Information area for clarifications.