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    Home / Science projects / Simple Machines: Make a Lever
    • Simple Machines: Make a Lever

      Simple Machines: Make a Lever

      Simple machines make work easier by multiplying, reducing, or changing the direction of a force. A lever is a type of simple machine. You can make one and experiment with how moving the pivot point, or fulcrum, changes the way the lever can lift things.

      What You Need:

      • A sturdy wooden ruler, piece of foam board, or thin piece of wood (we used a 24” piece of basswood, which can be purchased at a craft store)
      • A large binder clip
      • Weights or variety of objects (or small paper cups and pennies to use as weights)

      What You Do:

      1. Remove the metal clips from the base of the binder clip by squeezing the sides together and fitting the ends through the groove.

        Remove metal clips

      2. Set the lever (ruler, foam board, or wood) over the binder clip. Position it near the middle so that the board is balanced. The binder clip is called the fulcrum, which gives your lever a pivot point.

        Position the wood on the fulcrum.

      3. Place a weight on one end and note what happens to each end of the lever.
      4. Move the fulcrum (binder clip) closer to the end with the weight.

        Move the fulcrum closer to the weighted end.

      5. Place a lighter weight or object on the other end. If nothing happens, adjust the position of the binder clip (fulcrum) until the heavier end is raised up.

        Place another weight; adjust fulcrum.

      6. You have just made a lever and used it to lift a heavy object with a lighter one!
      7. You can experiment more by moving the fulcrum and changing the placement of the weights.

      What Happened:

      In this experiment, you took a basic ruler or piece of wood and added a fulcrum to make a simple machine called a lever! To understand how a lever works - picture a playground see-saw. With the heavier object on one end, the lighter (empty) end of the lever was raised up. By moving the fulcrum closer to the heavy end, you were able to use the lever to help you raise the heavier object when you placed a lighter one on the opposite end. This didn’t change anything about the lighter weight - it stayed exactly the same. Moving the lever’s pivot point closer to the object you were trying to lift changed how much force (or work) it took to lift the object. Moving the fulcrum closer to the object made it much easier to lift a heavy object. What do you think would happen if you moved the fulcrum the opposite direction? It would take more force, or in this example, a heavier weight to lift the object!

      When talking about levers, things can get a little confusing, so there are a few terms we can use to help keep things straight. In our experiment above, the heavy object we were trying to lift is called the load force. The lighter weight we used to lift the load force is called the effort force. When the fulcrum was in the middle of the lever, the effort force had to be greater than the load force in order to lift the load force up. But, by simply changing the pivot point of the lever, we were able to use a smaller effort force to lift the greater load force. That is the beauty of levers - making work easier by lowering the amount of force that is required to lift or move something!

      For further study, try these:

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    Comments




    By: gracy
    Date: Jan 09, 2016

    i dont understand what you meant about the binder clip and taking the metal part ou
    explain properly