http://astroacademy.org.uk/resources/collisions/
model by lookang
the contact force appears to be slightly different, i speculate is due to the video perspective error of not being perfectly square to the motion
sources of errors
Tracker model builder has systemic error?
video is taken sideways with a slight perspective error that can result in the discrepant data
motion is not perfectly in x direction?
Author: video by Tim Peake, Robin Mobbs, Anu Ojha, Andy McMurry, and Sophie Allan , model by lookang
Contact: weelookang@gmail.com
More information at: http://weelookang.blogspot.sg/2016/11/astro-academy-collisions-two-equal-mass.html