I'm trying to improve on tension problems so I am practicing using this website: http://www.education.com/study-help/article/tension/ I am on problem 6, but I keep coming up with the wrong answers. I attempted this by trying to show the net forces for each box. Box M net forces T upwards Mg downwards F = T - Mg = Ma Box 2M net forces T upwards T' downwards ***should I include the weight (2Mg) of this box??? Box 4M net forces 4Mg downwards T' upwards F = 4Mg - T' = 4Ma I have a feeling there is an error in box 2M that is fudging with my results. Lastly, does T = 6Mg? Help??