This is going to seem a somewhat basic question to most people. However, I am trying to build a project where a weight on a pulley weighs 5kg on the way up but 8kg on the way down, then 5kg on the way up and 8kg on the way down, and so on.... So its heavier on the way down. I was just wondering how a 'pulley system' would would to ensure this. Or if a pulley system would be the best/cheapest way. I really cant get my head round it. any help would be much appreciated.