Question

levers quick check
with which class of levers is it possible to increase the force that must be applied? (1 point)
class 3 and 4
class 1 and 3
class 1 and 2
class 2 and 3

Explanation:

Class 1 levers can either increase force or distance depending on the position of the fulcrum. Class 2 levers always increase force (effort arm longer than load arm). Class 3 levers always increase the distance moved (load arm longer than effort arm, so force is increased). There is no Class 4 lever in the standard lever classification system.

Answer:

Class 1 and 3