Calculating Force; A Nut Pushing Down on a Screw Hello, I'm new to Physics Forums, and this question is not really about schoolwork/coursework, however because it is somewhat school related, I was afraid to post it anywhere else. Anyway, I am doing a science fair project where I am designing/building a machine, and to know if it will work/be efficient, I have to calculate a force. 1. The problem statement, all variables and given/known data If a nut, affixed to external pillars in a way that would prohibit it from spinning, but allow it to move vertically, is exerting 9.8 N (its mass is 1 kg) downward onto a screw with a thread of 45°, with how much force would the screw spin? If you need any further information/variables, just ask and I will quickly provide. 2. The attempt at a solution Even though I am a very advanced student (I skipped 7th grade), I am only in 8th grade, and my school doesn't offer physics of this level, so I don't even know where to start. If you do this problem for me, would you please explain the process of solving it, if it isn't a problem? Also, if you don't want to outright do this problem for me, could you at least point me to some sources that would show me how to solve the problem? I fully understand middle school physics, I am currently completing Algebra 1, and I have a basic understanding of trigonometry. Thank you for even taking the time to read this, and I would be very grateful if you would help me in any way.