Pulleys lift a heavy load

The guy who invented the pulley system for lifting heavy objects deserves a prize. Really, he does. Pulleys changed the world even more than Steve Jobs or his newfangled gadgets have done. ;)

If you've ever wondered (as one does) how to calculate how much force is required to lift a heavy object using pulleys then take a look at this quick demonstration and formula on the Dynamic Science site. It's so simple, even I got it!