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# Levers

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Introduction to levers

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### Levers

1. 1. Levers
2. 2. Definition <ul><li>A simple machine </li></ul><ul><li>A board or bar that rests on a turning point called the fulcrum </li></ul><ul><li>Used to change the amount, the strength and the direction of movement. </li></ul><ul><li>The position of the force and the load can be changed by moving them to different points on the lever. </li></ul>
3. 3. Definition <ul><li>The position of the force and the load can be changed by moving them to different points on the lever. </li></ul><ul><li>An object that a lever moves is called the load or load force.  </li></ul><ul><li>The force used to move a lever is called the effort force. </li></ul><ul><li>The closer the object is to the fulcrum, the easier it is to move. </li></ul>
4. 4. 1 st Class or Class 1 Lever <ul><li>The load force and the effort force are separated by the fulcrum </li></ul><ul><li>As one moves up the other moves down. </li></ul><ul><li>The amount and the strength of the movement is depends on the distance from the fulcrum </li></ul>http://www.hometrainingtools.com
5. 5. Remember: The force that is pushing down is the EFFORT FORCE The force of the load or weight is the LOAD FORCE
6. 6. 2 nd Class or Class 2 Lever <ul><li>The load force is between the effort force and the fulcrum. </li></ul><ul><li>This lever uses mechanical advantage to make moving large weights easier. </li></ul>http://www.hometrainingtools.com
7. 7. Remember: The force that is pushing down is the EFFORT FORCE The force of the load or weight is the LOAD FORCE
8. 8. 3 rd Class or Class 3 Lever <ul><li>The effort force is between the fulcrum and the load. </li></ul><ul><li>Mechanical advantage is reduced but more movement is possible. </li></ul>http://www.hometrainingtools.com
9. 9. Remember: The force that is pushing down is the EFFORT FORCE The force of the load or weight is the LOAD FORCE
10. 10. http://lpc1.clpccd.cc.ca.us/lpc/DivisionIII/images/DSNT/Levers.jpg