1. Levers
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2. Definition
A board or bar that rests on a turning point called the fulcrum, used to change the amount, the strength and the direction of movement.
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3. An object that a lever moves is called the load or load force.
The force used to move a lever is called the effort force.
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4. The closer the load force is to the fulcrum, the easier it is to move.
The position of the effort force and the load can be changed by moving them to different points on the lever.
The closer the load force is to the fulcrum, the easier it is to move.
The load force
is easier to lift because it is closer to the fulcrum
Effort Force
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5. 1st Class or Class 1 Lever
The load force and the effort force are separated by the fulcrum
As one moves up the other moves down.
The amount and the strength of the movement is depends on the distance from the fulcrum
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6. 1st Class Levers Back Next LOAD

7. 2nd Class or Class 2 Lever
The load force is between the effort force and the fulcrum.
This lever uses mechanical advantage to make moving large weights easier.
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8. 2nd Class Levers Back Next

9. 3rd Class or Class 3 Lever
The effort force is between the fulcrum and the load.
Mechanical advantage is reduced but more movement is possible.
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10. 3rd Class Levers Back Next Effort

11. Review:
Classes of Levers
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12. Review: Classes of Levers First Class Second Class Third Class Back