### Software Requirements

SoftwareRequirements

 Android iOS Windows MacOS with best with no no need Java need Java support full-screen? no no Yes Yes cannot work on no mobile browser  understand Java.... no mobile browser  understand Java.... install Tracker from http://physlets.org/tracker/ install Tracker from http://physlets.org/tracker/

### Credits

Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
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### Video

https://youtu.be/ZFyy3LYPVIg   tracker modeling explained by lookang lawrence wee

## model A no force

 http://weelookang.blogspot.sg/2015/06/tracker-motion-of-person-progressive.html Video Download, Download2 author video:  ning, model: lookangwhen fx = 0 , there is no motion, vx =0, note that y = -0.1 is for visualization purposes.

## model B constant speed

 http://weelookang.blogspot.sg/2015/06/tracker-motion-of-person-progressive.html Video Download, Download2 author video:  ning, model: lookangwhen fx = 0 and initial vx = 1.54, there is constant velocity motion, vx =1.54. notice the model is some what correct but not a close enough mathematical representation of the real motion.

 http://weelookang.blogspot.sg/2015/06/tracker-motion-of-person-progressive.html Video Download, Download2 author video:  ning, model: lookangwhen fx = 0 , there is no motion, vx =1.54, note that y = -0.2 is for visualization purposes

## model C accelerate

 http://weelookang.blogspot.sg/2015/06/tracker-motion-of-person-progressive.html Video Download, Download2 author video:  ning, model: lookangwhen fx = 0.965*2 (from data analysis trend line parabolic fit, coefficient of A which is $$\frac{1}{2}a$$) and initial vx = 0.2898 (from data analysis tool of mass A hand), there is constant acceleration motion. notice the model is some what getting better but still not a close enough mathematical representation of the real motion.

$$\frac{1}{2}a$$

 http://weelookang.blogspot.sg/2015/06/tracker-motion-of-person-progressive.html Video Download, Download2 author video:  ning, model: lookangwhen fx = 0.965*2 , and initial vx = 0.2898, there is constant acceleration motion,, note that y = -0.3 is for visualization purposes

## model D accelerate fx = 0.965*2 N for t = 0 to 0.8 s and constant speed v =1.83 m/s for t> 0.8 s

 http://weelookang.blogspot.sg/2015/06/tracker-motion-of-person-progressive.html Video Download, Download2 author video:  ning, model: lookangwhen fx = if(t<0.8,0.965*2,0)  (computational thinking and mathematical demonstrating newton's 2nd and 1st law together) and initial vx = 0.2898 (from data analysis tool of mass A hand), there is constant acceleration motion. notice the model a close enough mathematical representation of the real motion.

 http://weelookang.blogspot.sg/2015/06/tracker-motion-of-person-progressive.html Video Download, Download2 author video:  ning, model: lookangwhen fx = if(t<0.8,0.965*2,0) , and initial vx = 0.2898, there is constant acceleration motion,, note that y = -0.4 is for visualization purposes

Tracker Motion of Person Progressive Model Building Pedagogy is made clear by lookang.
many thanks to the Open Source Physics community, +Douglas Brown and many more of them