1. A led cylinder hangs on a string. By another string, another cylinder is hung on the previous cylinder. If you pull fast enough, the lower string tears, if you pull slowly, the upper one tears. How does one explain this? I tried to explain this with the help of Newton's second law, but I seem to be having some problems with the tension forces. Could someone offer an explanation? 2. On an elevator ceiling hangs an object with mass m1=1kg. On that object, another one with mass m2=2kg is hung. What is the tension force in the upper string, if the tension force in the string between the two objects is 9,8 N? Again, the tension forces seem to be giving me some trouble. I think that the tension in the string between the two objects should be 2*g, which it isn't in the problem. Could someone help?