ADD TO NOTES
Lever is one of the simplest mechanical devices.
A lever consists of a beam or stick or rod. However, a lever by itself is not effective. It must have something on which to pivot.
This pivot is called a fulcrum. A lever helps to lift weights with less effort.
- Children on opposite ends of a seesaw lift each other's weight up and down easily.
- Anyone who has ever pried something loose with a crowbar or a board has used a lever.
FIRST-CLASS LEVER
- Fulcrum in the middle
- weight at one end
- force at the other end
SECOND-CLASS LEVER
- Fulcrum at the end
- weight in the middle
- force at the other end
THIRD-CLASS LEVER
- Fulcrum at the end
- weight at the other end
- force in the middle
