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    Levers Levers Presentation Transcript

    • Levers For Mrs. Berg’s Science Class
    • A lever consists of a rod or bar that rests and turns on a support called a fulcrum . effort resistance
    • 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
    • Prying something loose with a crowbar is using a lever. Some machines, such as a catapult, use a lever to hurl objects.
    • Here is a catapult you could make.
    • Three Classes of Levers
      • First Class Lever
        • The fulcrum is between the effort force and the resistance force.
      resistance fulcrum effort
    • Three Classes of Levers
      • Second Class Lever
        • The resistance is between the effort and the fulcrum.
    • Three Classes of Levers
      • Third Class of Lever
        • The effort is between the fulcrum and the resistance.
    • First Class Lever Second Class Lever Third Class Lever
    • Levers on the internet
      • Check out these websites!
      • http://www.dynamicscience.com.au/tester/solutions/hydraulicus/simplemachineslevers1.htm
      • LEVERS in our BODIES!
      • http://www.dynamicscience.com.au/tester/solutions/hydraulicus/humanbody.htm
      • http://www.montgomery.k12.ky.us/camargo/Projects/simplemachines/simplemachines.htm
    • 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.
    • An example in the human body of a second-class lever is the Achilles tendon , pushing or pulling across the heel of the foot.
    • 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.
    • First Class Lever Second Class Lever Third Class Lever
    • 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.
    • 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.
    • 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
    • beam bar rod board
    • rotate Turn
    • effort Resistance / Load fulcrum
    • work
    • friction
    • Mechanical Advantage