1. The problem statement, all variables and given/known data You have a screw with the distance between the threads being equal to 0.1mm. It takes a torque of 10Nm to turn the screw about 2pi radians. What would the torque be to turn a screw with the z distance equal to 0.2mm. Explain your reasoning. 2. Relevant equations Not sure. 3. The attempt at a solution I'm not sure how to do this at all. I guess we can assume that the resistive force we have to overcome is proportional to the length of metal we are driving into the material. So by that logic, and a simplification: If we took the z index as the height of a rectangle, and the circumference of the screw as the width, the diagonal distance would be the distance of metal that goes through the wood. So we just find the ratio of the second diagonal, to the first, and multiply the Torque by this? Or is there something I'm missing, this seems too easy.