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Question

Why do we use class III  levers although they have mechanical advantage less than one?


  1. To obtain gain in speed

  2. To obtain loss in speed

  3. It acts as force multiplier

  4. It is used in raising a load


Solution

The correct options are
A

To obtain gain in speed


Class III levers have mechanical advantage less than one, but by using them we get a gain in speed, i.e. a larger movement of the load is obtained by smaller movement of effort arm. For example, the blade of a knife moves longer by smaller movement of its handle.

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