How could Class III Levers till be considered Levers at all?

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SUMMARY

Class III levers are classified as levers despite having a mechanical advantage of less than 1, which increases the force required to perform work. This classification does not alter the fundamental physics of levers but highlights the importance of understanding the reference frame and pivot point in lever mechanics. The discussion critiques the traditional definition of a lever, suggesting it lacks utility as it could also apply to hydraulic systems. Ultimately, the classification of levers serves to guide the application of appropriate equations in physics.

PREREQUISITES
  • Understanding of basic physics principles, particularly mechanics.
  • Familiarity with the concept of mechanical advantage.
  • Knowledge of lever classifications: Class I, Class II, and Class III levers.
  • Awareness of reference frames in physics.
NEXT STEPS
  • Research the principles of mechanical advantage in different lever classes.
  • Study the physics of hydraulic systems and their relation to levers.
  • Examine the role of reference frames in mechanical systems.
  • Explore practical applications of Class III levers in real-world scenarios.
USEFUL FOR

This discussion is beneficial for physics students, educators, and engineers who seek a deeper understanding of lever mechanics and the implications of classification systems in physics.

ELLE_AW
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I thought the definition of a Lever was a machine that will decrease the force needed to do work by increasing distance. Since Class III levers always have a mechanical advantage less than 1, and they actually increase the force needed, how could they be considered levers at all? I don't get it.
 
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Does changing the classification change the physics? The useful kinds of classifications are ones that guide you to use appropriate equations.

That said, I have never seen that definition of a lever and I don’t think it is a particularly good definition since it would apply to hydraulics also. I think that this is a rather trivial concern based on a poor definition.
 
Last edited:
ELLE_AW said:
It seems to go against the definition.
Your definition of a lever is not very useful then. And the classifications of levers in general depend on the reference frame and what you consider the pivot, which is kind of arbitrary.
 

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