Tracker Cart rolling down a Gentle Slope 4 degree

Tracker Cart rolling down a Gentle Slope 4 degree
video: RGS, model: lookang

http://weelookang.blogspot.com/2015/03/tracker-cart-rolling-down-gentle-slope.html
model: vx = 0.1295, fx = 0.1591
author: video from rgs, model lookang
https://dl.dropboxusercontent.com/u/44365627/lookangEJSworkspace/lookangejss/02_newtonianmechanics_2kinematics/trz/cartrollingdownaslopegentle.trz

http://weelookang.blogspot.com/2015/03/tracker-cart-rolling-down-gentle-slope.html
model: vx = 0.1295, fx = k*m*sin(4*pi/180) where k is the constant due to rotational inertia instead of k =1 for point mass.author: video from rgs, model lookang
https://dl.dropboxusercontent.com/u/44365627/lookangEJSworkspace/lookangejss/02_newtonianmechanics_2kinematics/trz/cartrollingdownaslopegentle.trz

reference:

http://farside.ph.utexas.edu/teaching/301/lectures/node108.html