Q:

Which of the following statements is characteristic of “third-class levers”?

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Which of the following statements is characteristic of “third-class levers”?


  1. the fulcrum lies between the effort and the load.
  2. the muscular effort involved in shifting them exceeds the load that is shifted.
  3. they are effi cient levers.
  4. the effort and the load are equally distant from the fulcrum.

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B: third class levers are “ineffi cient” in the sense that the muscular force that needs to be exerted will exceed the load force to be shifted.

  Nevertheless human muscles are able to generate the forces required for human activities, and we have the benefi t of a very large range of movement for our limbs.

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