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Introduction to levers

Introduction to levers

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Transcript

  • 1. Levers
  • 2. Definition
    • A simple machine
    • 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.
    • The position of the force and the load can be changed by moving them to different points on the lever.
  • 3. Definition
    • The position of the force and the load can be changed by moving them to different points on the lever.
    • 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.
    • The closer the object is to the fulcrum, the easier it is to move.
  • 4. 1 st 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
    http://www.hometrainingtools.com
  • 5. Remember: The force that is pushing down is the EFFORT FORCE The force of the load or weight is the LOAD FORCE
  • 6. 2 nd 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.
    http://www.hometrainingtools.com
  • 7. Remember: The force that is pushing down is the EFFORT FORCE The force of the load or weight is the LOAD FORCE
  • 8. 3 rd Class or Class 3 Lever
    • The effort force is between the fulcrum and the load.
    • Mechanical advantage is reduced but more movement is possible.
    http://www.hometrainingtools.com
  • 9. Remember: The force that is pushing down is the EFFORT FORCE The force of the load or weight is the LOAD FORCE
  • 10. http://lpc1.clpccd.cc.ca.us/lpc/DivisionIII/images/DSNT/Levers.jpg