Lakewood Public Library Science Questions 1-4 are based on the following passage and diagrams.
Levers are a commonly used from of simple machine.
A lever rotates on a fulcrum. A lever has a point where an applied or effort force exists, and a point where a load or resistance force exists. For a lever to perform work, the effort force must overcome the resistance force. Levers are divided into three classes. The figure below shows the characteristics used to classify levers, as well as examples of the three classes of levers.