Briefly describe the three categories of levers based on the position of their fulcrum. Give an example of each type of lever and state whether the lever works at a mechanical advantage, disadvantage or both
What will be an ideal response
If the fulcrum is between the effort and the load it is a first class lever. Scissors are an example of a first class lever. A first class lever can produce either a mechanical advantage or disadvantage depending on whether the effort or load is closer to the fulcrum. If the load is between the fulcrum and the effort, it is a second class lever. A wheel barrow is an example of a second class lever. They operate at a mechanical advantage because the load is always closer to the fulcrum than the effort. If the effort is between the fulcrum and the load, it is a third class lever. Forceps are an example of a third class lever. They operate at a mechanical disadvantage because the effort is always closer to the fulcrum than the load.
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