I'm looking for something that can pull on a string at a constant force per second So that i can graph Force (n) over Time (s) just like that: in this graph, the red line represents the tension of a string as i pull on it. However, i really need that slope to be constant. By the i'm investigating how different force per second affects the breaking force of the string From preliminary experiments, i observed that that: the trough of the graph is when the string breaks. The larger N/s applied, the string breaks at a higher tension The lower N/s applied, the string breaks at a lower tension WHY IS THIS SO? which equations can i use?