Question

explain what distinguishes first class levers from second and third class levers.

Explanation:

Levers are categorized by the relative positions of the fulcrum (fixed pivot), effort (applied force), and load (resistance moved). First class levers have the fulcrum positioned between the effort and the load. In contrast, second class levers have the load between the fulcrum and effort, and third class levers have the effort between the fulcrum and load. This fulcrum placement is the key distinguishing feature.

Answer:

First class levers are distinguished by having the fulcrum (fixed pivot point) located between the applied effort and the load being moved. This is different from second class levers (load between fulcrum and effort) and third class levers (effort between fulcrum and load).