Hi
I have a question about pulley.
There is fixed pulley: http://en.wikipedia.org/wiki/File:Polea-simple-fija.jpg http://en.wikipedia.org/wiki/File:Polea-simple-fija.jpg where you need to use e.g. 100N to lift 100N.
There is moveable pulley: http://en.wikipedia.org/wiki/File:Pulley1a.svg...