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Understanding Levers and Torque: Exploring the Three Classes

Explore the relationships between force, distance, and torque for the three classes of levers. Investigate lever types, mechanical advantage, and efficiency in this interactive lab activity.

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Understanding Levers and Torque: Exploring the Three Classes

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  1. Levers and Torque: More Practice

  2. Levers and Torque: More Practice

  3. Levers and Torque: More Practice

  4. Classes of Levers: Student Learning Goal The student will investigate the relationships between force, distance, and torque for the load arm and effort arm of the three classes of levers (C2.4, C2.5).

  5. Classes of Levers SPH4C

  6. 1st Class Levers A 1st class lever has the fulcrum in the centre: The fulcrum may be positioned closer to the load or closer to the effort force.

  7. 1st Class Levers A 1st class lever has the fulcrum in the centre: Example: a seesaw

  8. 2nd Class Levers A 2nd class lever has the load in the centre:

  9. 2nd Class Levers A 2nd class lever has the load in the centre: Example: a wheelbarrow

  10. 3rd Class Levers A 3rd class lever has the effort force in the centre:

  11. 3rd Class Levers A 3rd class lever has the effort force in the centre: Example: the human forearm

  12. Mechanical Advantage Revisited The ideal mechanical advantage of a lever is defined as the ratio of the effort arm to the load arm:

  13. Mechanical Advantage Revisited The ideal mechanical advantage of a lever is defined as the ratio of the effort arm to the load arm: Note that for 3rd class levers, the IMA will be less than 1!

  14. Mechanical Advantage Revisited The actual mechanical advantage of a lever is defined as the ratio of the load force to the effort force: (and again, this may be less than 1)

  15. Mechanical Advantage Revisited This mechanical advantage may be affected not only by friction but also by factors such as the weight of the lever itself.

  16. Efficiency Efficiency is, as before: Note that a lever can have a low (even less than 1) AMA and IMA but still have a high efficiency if the AMA is close to the IMA.

  17. More Practice Three Classes of Levers Lab Activity

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