Lever theory Name: Levers are basic mechanisms that are in widespread use. There are many examples of levers in everyday items, often unknown to the user. Levers are mechanisms that consist of three components: The point at which the lever pivots The energy or effort put into the mechanism The energy or work that comes out of the mechanism i) Label the three definitions above with the correct compo­ nent names Levers can be grouped into three different classes Class 1 lever Output A class one lever has its Input Fulcrum input on one side of the ful­ crum and its output on the other. Class 2 lever Output Input Fulcrum A class two lever has its input at one end of the lever, its output in the mid­ dle and fulcrum at the other end. Class 3 lever Input Fulcrum Output A class three lever has its output at one end of the lever, its fulcrum at the other with its input in the middle. What class of lever are these items? ii) Write the class of lever in the box for each example above, then label the input, output and fulcrum. iii) Using the back of this sheet­
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List two examples of first, second and third class levers
Draw one of the objects you have listed
Label the input, output and fulcrum on the diagram Turn the page >>
Lever theory 2 examples: Class 1 lever Please circle: Mechanical Advantage or Mechanical Disadvantage 2 examples: Class 2 lever Please circle: Mechanical Advantage or Mechanical Disadvantage 2 examples: Class 3 lever Please circle: Mechanical Advantage or Mechanical Disadvantage