Classical Mechanics- Newton's law, Tension In Strings

Description
Topics like Newton's laws of motion, reference frames etc.must have been discussed hundreds of times but this is different where new concepts come out. To explain tension in string very simple yet elegant example has been used. The experiment on tension is left as a puzzle--see whether you can solve it.

Prof. Walter Lewin, 8.01 Physics I: Classical Mechanics, Massachusetts Institute of Technology: MIT OpenCourseWare), http://ocw.mit.edu (Accessed June 8, 2011). License: Creative Commons BY-NC-SA: http://ocw.mit.edu/terms/#cc