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Levers, Wheels And Axles, Pulleys
 

Levers, Wheels And Axles, Pulleys

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created for 5th grade science classroom

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    Levers, Wheels And Axles, Pulleys Levers, Wheels And Axles, Pulleys Presentation Transcript

    • Levers 1 st Class Levers 2 nd Class Levers 3 rd Class Levers
    • What is a Lever?
      • A lever is a simple machine that is used to lift things.
      • It is made up of a bar (called the lever stick) and a support (called the fulcrum).
      Lever Stick Fulcrum
    • Everyday Examples of Levers
      • See-Saw
      • Nutcracker
      • Wheelbarrow
      • Broom
      • Can you think of any more?
    • Parts of a Lever
      • There are different parts and sections of a lever.
      • You have the fulcrum and lever stick.
      • You also have a force side and a load side.
      • The relationship between the position of the load side, fulcrum, and force side determines what class of lever it is.
    • Classes of Levers
      • There are three different classes of levers.
        • 1 st Class: force side-fulcrum-load side
        • 2 nd Class: force side-load side-fulcrum
        • 3 rd class: load side-force side-fulcrum
    • 1 st Class Lever
      • Structure of the 1 st Class Lever:
        • Force Side-Fulcrum-Load Side
      • The see-saw is an example of a first class lever.
      • The force needed to lift the load decreases when the fulcrum gets closer to the load side.
    • 2 nd Class Lever
      • Structure of a 2 nd Class Lever
        • Force Side-Load Side-Fulcrum
      • The wheelbarrow and the nutcracker are examples of a 2 nd class lever.
      • Again, The force needed to lift the load decreases when the fulcrum gets closer to the load side.
    • 3 rd Class Lever
      • Structure of a third class lever
        • Load Side–Force Side–Fulcrum
      • The broom is an example of a 3 rd class lever.
        • The load is the dirt or end of the broom, the force is your bottom arm, and the fulcrum is your top hand.
    • What type of lever am I (1,2,or3)? 1 st Class 1 st Class 2 nd Class 2 nd Class 3 rd Class 3 rd Class
    • Wheels and Axles Wheel and Axle
    • What is a Wheel & Axle?
      • A wheel and axle is a simple machine consisting of a wheel that revolves (turns) around a post (axle).
      • This simple machine makes it easier for us to move things from one place to another.
      • The further the force is away from the axle, the easier it is to turn the wheel. This means that it is easier to turn a big wheel than a small wheel.
    • Pictures of Wheels and Axles
    • Common Examples
    • Pulleys Fixed Pulley Movable Pulley Block and Tackle
    • What is a Pulley?
      • Pulleys are a kind of simple machine that consists of a rope that fits onto a wheel and changes the direction of a force.
      • There are three kinds of pulleys.
        • Fixed Pulley
        • Movable Pulley
        • Block and Tackle (combo of fixed and movable)
    • Fixed Pulley
      • Wheel attached to surface
      • Changes the direction of the applied force
      • NO mechanical advantage – same amount of force is required
    • Movable Pulley
      • Pulley moves along the rope
      • Wheel supports the load
      • Effort is in the same direction as movement
      • Reduces the forces needed to move an object
    • Block and Tackle
      • Has at least two wheels (one movable and one fixed)
      • The more complex the pulley, the more the effort needed to move the object decreases
    • Common Examples Of Pulleys