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OBJECTIVES:
What is a machine? A machine is any device that
can apply mechanical energy at one point and deliver it in
a more useful form at another point. Simple machines are
all around us and help us accomplish work faster and easier
many times each day.
In this demonstration you will use an lever and fulcrum to move
a heavy load. Examples of levers planes include: see-saws (teeter-totters),
a claw hammer, a crow bar, bottle opener, car jacks and piano keys.
STEPS TO FOLLOW:
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Review the information in the
background section.
You will use the ruler as the lever,
the rod as the fulcrum and the
book as the heavy object.
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Insert an end of the lever (ruler) under the edge of heavy object (book).
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Place the fulcrum under lever, approximately in the middle.
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Push down on the lever and notice how far the object is raised. Notice
the force to lift the object.
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MATERIALS:
12" Ruler
1/4" to 1" Diameter Rod Or Similar Part To Use As A Fulcrum
Book Or Similar "Heavy" Object
Optional
Rulers Over 12" Or Yardstick
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Lift the object by hand and notice the difference in applied force.
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Change the placement of the fulcrum and repeat Step 4 a number of times.
How does changing the position of the fulcrum change the function of the lever?
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Optional:
Use a longer ruler or yardstick as your lever. Repeat Steps 3 and 4.
How does changing the length of the lever change the function of the lever?
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