Mass on a moving wedge

This video contains an excellent analysis to a rather hard problem: A mass resting on a wedge, which itself is free to slide on a horizontal plane. The problem is complicated because (a) there are two accelerations to keep track of, and (b) the kinematic constraint is not-so-easy to apply. Special attention to the careful use of a ghost force (which is fine!) in the accelerating frame. Quiz 1: http://webtest.boun.edu.tr/lms/?r=quiz/2/1 Quiz 2: http://webtest.boun.edu.tr/lms/?r=quiz/2/2 Quiz 3: http://webtest.boun.edu.tr/lms/?r=quiz/2/3 Homework: http://webtest.boun.edu.tr/lms/?r=quiz/2/homework ( The full playlist "Introductory Physics" is at https://www.youtube.com/playlist?list=PLV36j4vp1RdnNHWx9GaCqQ7mZkUefs4lM )