I have a question about pulley

adamwojciech

Hi

I have a question about pulley.
There is fixed pulley: 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 where you need to use e.g. 50N to lift 100N.

Question: How does "reversed moveable" pulley look like, i.e. the one where I need to use 200N to lift 100N? I need it for my home gym.

Thanks
Adam

K^2

On the image for moving pulley, picture weight hanging from the free end of the rope instead of from the moving pulley. It will take 200N of downward force on the moving pulley to lift the 100N weight in that case.

Pkruse

Google images for a block and tackle, or a mobile crane block. Once you see one rigged up your answer should be self evident.