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  • 1. Levers For Mrs. Berg’s Science Class
  • 2. A lever consists of a rod or bar that rests and turns on a support called a fulcrum . effort resistance
  • 3. A force of effort is applied at one end of the rod to lift a load placed at the other end. A lever can help lift a weight with less effort. effort resistance fulcrum
  • 4. Prying something loose with a crowbar is using a lever. Some machines, such as a catapult, use a lever to hurl objects.
  • 5. Here is a catapult you could make.
  • 6. Three Classes of Levers
    • First Class Lever
      • The fulcrum is between the effort force and the resistance force.
    resistance fulcrum effort
  • 7. Three Classes of Levers
    • Second Class Lever
      • The resistance is between the effort and the fulcrum.
  • 8. Three Classes of Levers
    • Third Class of Lever
      • The effort is between the fulcrum and the resistance.
  • 9. First Class Lever Second Class Lever Third Class Lever
  • 10.  
  • 11.  
  • 12. Levers on the internet
    • Check out these websites!
    • LEVERS in our BODIES!
  • 13. Levers in the Body
    • An example of a first-class lever is the joint between the skull and the atlas vertebrae of the spine: the spine is the fulcrum across which muscles lift the head.
  • 14. An example in the human body of a second-class lever is the Achilles tendon , pushing or pulling across the heel of the foot.
  • 15. An example of a third-class lever in the human body is the elbow joint : when lifting a book, the elbow joint is the fulcrum across which the biceps muscle performs the work.
  • 16. First Class Lever Second Class Lever Third Class Lever
  • 17.  
  • 18.  
  • 19. Key Concepts:
    • A lever pivots on one fixed point – up and down or side to side.
    • To use a lever, effort is applied to one end by pushing or pulling. The lever transfers this force to move the load.
  • 20. Key Concepts:
    • A lever can make work easier in the following ways:
      • Increasing the force being applied.
      • Changing the direction of the force.
      • Increasing the distance or speed at which the job is done.
  • 21. Vocabulary
    • Simple Machine- a machine with one moving part
    • Lever –a beam, bar, rod that turns or rotates on or around a fixed point
    • Fulcrum – a fixed point that allows the beam to rotate around it.
    • Work – the use of force to move an object
    • Force –any kind of push or pull on an object
    • Effort – the force that is used to do the work
    • Resistance – the force (load) that works against the effort
    • Load –the object or resistance being moved by the effort
    • Friction – the force that is caused when 2 surfaces rub together as an object moves
    • Mechanical Advantage – how the simple machine increases the effort
  • 22. beam bar rod board
  • 23. rotate Turn
  • 24. effort Resistance / Load fulcrum
  • 25. work
  • 26. friction
  • 27. Mechanical Advantage