I wasn't quite sure which section to post this in but engineering was the closest to my application, although this could be a basic physics question. I'm not sure. I want to learn how to design a counterbalance such as that in an engine crankshaft. This mechanism has been of interest to me lately, not necessarily applied to engines but the crankshaft and how the lobes are calculated and balanced so perfectly in rotating equipment. Specifically what I would like to understand: - How to calculate the mass and placement of the mass for the counterbalance. - How a dynamic balancing system can work. Specifically how does a mass that extends further from "center" modify the balance. The mechanism that comes to mind is one that is in a centrifuge I saw. There was a weight that got extended further out from the geometric center. Would this produce a force similar to a teeter totter? "Cantilever"? This thread comes to mind: https://www.physicsforums.com/threads/shaft-balancing.825599/ However, I do not have a background in physics so I am looking for the scientific names of what I should be researching as I have been unable to find much information on this specific subject in engineering texts I assume this might be straight applied physics? What I think I'm looking for: - Scientific terms of the balancing, counterbalancing mechanism as they relate to physics so that I know what I'm looking for. - Book recommendations, or a place to start researching. - The name of the mechanism of which if force is applied to a cantilever?? that it multiplies torque at the cost of distance travelled? (I can't remember the name and googling the terms like cantilever isn't finding me what I'm looking for) I think I can figure out the actual applications and design parts if someone can point me towards the correct terms for these items. I genuinely appreciate it!