1. In tearing a paper towel or plastic bag from a roll, why is a sharp jerk more effective than a slow pull 2. I found this answer online A quick, sharp jerk means a greater acceleration and a greater acceleration means a greater force. And it is force that tears the paper towel or plastic bag 3. The attempt at a solution I was thinking not only the force of the jerk like the answer online said but wouldn't it be as well because the roll is ƩF = 0 and the quick acceleration of the one piece while the rest remain unmoved? I don't know if that is confusing sorry if it is.