Let’s take a look at some of the simple mechanisms that they use. Pulleys and gears.When a flag is raised, it will often be lifted using a pulley mechanism. A pulley is a wheel on a fixed axle.

After a couple of millennia of fiddling with gears, you’d think there wouldn ... infinitely variable transmission built from nested pulleys, and you realize there’s always room for improvement.

This video explores different methods that can be use to amplify a force, and focuses on three types of machine - levers, ...