1-4. Types of stresses.
Levers and Moment of Force. A lever isa useful
device found in tools such as jacks, shears, wrenches,
and pliers To use tools and balancing procedures cor-
rectly, the repairer needs to understand moment of force
(amount of leverage).
Levers. Levers are classified as three types
according to the position of the applied force (effort), the
resistance, and the fulcrum (the pivot point) (Figure 1-5).
In Type 1 the fulcrum is located between the applied
effort and the resistance. In Type 2 the resistance is
located between the fulcrum and the applied effort. In
Type 3 the applied effort is located between the resist-
ance and the fulcrum.
1-5. Types of levers.