Pulleys
A wheel with a groove for a rope. Pulleys redirect force and can multiply it.
- Fixed pulley: Attached to ceiling. Changes direction only. MA = 1.
- Movable pulley: Attached to the load. Two rope segments support the load. MA = 2.
- Compound (block and tackle): Multiple pulleys. MA = number of rope segments supporting the load.
- 3 segments: MA = 3 (lift 300 N with 100 N, but must pull 3 m of rope per 1 m load rises)
- 4 segments: MA = 4