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First Class Lever
Fulcrum is located between the effort and the resistance forces.
Effort and resistance forces are applied to the lever arm in the same direction.
Only class of lever that can have an MA greater than or less than 1.
Second Class Lever
Fulcrum is located at one end of the lever.
Resistance force is located between the fulcrum and the effort force.
Resistance force and effort force are in opposing directions.
Always has a mechanical advantage >1.
Third Class Lever
Fulcrum is located at one end of the lever.
Effort force is located between the fulcrum and the resistance.
Resistance force and effort force are in opposing directions.
Always has a mechanical advantage < 1.
Moment
The turning effect of a force about a point equal to the magnitude of the force times the perpendicular distance from the point to the line of action from the force.