Pulleys use mechanical advantage, similar to levers, to lift loads. Pulleys are wheel shaped with a groove that allows a cord or chain to sit inside the groove. A single pulley changes the ...

end of the lever, h, falls into the notch, where it is firmly held by the s pri n g, i. By drawing the co rd, k, the belt is shifted back upon the tight pulley, B. Behind the levers, !I a n d h ...

This video explores different methods that can be use to amplify a force, and focuses on three types of machine - levers, pulleys and gears. The amplification of a force is called mechanical advantage ...