What are the mechanics behind the wheel and axle simple machine?

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Discussion Overview

The discussion centers around the mechanics of the wheel and axle as a simple machine, exploring how mechanical advantage is achieved through different applications of force. Participants examine the implications of applying force to either the wheel or the axle and the resulting effects on distance and force required.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant notes that applying force through the wheel to turn the axle results in mechanical advantage, allowing for less force to be used over a greater distance.
  • Another participant agrees and suggests that this can also be viewed as gaining more distance for the applied force.
  • A different perspective highlights the relationship between the circumferences of the wheel and axle, indicating that one revolution of each involves a different distance traveled due to the wheel's larger circumference.
  • One participant introduces the idea that wheels typically turn on axles and are not rigidly connected, suggesting that considering different size gears could clarify the mechanics involved.

Areas of Agreement / Disagreement

Participants generally agree on the basic mechanics of the wheel and axle, but there are nuances in how force application is conceptualized and the implications of wheel and axle connection that remain open for further exploration.

Contextual Notes

Some assumptions about the rigidity of connections between wheels and axles are not fully explored, and the discussion does not resolve the implications of different configurations, such as gears.

gearhead
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I have a question about the simple machine: the wheel and axle. I know already that mechanical advantage through a wheel and axle system is achieved by force being applied through the wheel to turn the axle. This mechanical advantage would be in the form of you applying less force, but over a greater distance. But, if you do the opposite and apply the force through the axle to turn the wheel, then you would have to apply much more force, but over a shorter distance right?
 
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That's right. You can look at it another way too. You get more distance for the applied force.
 
You can also think about the motion of the wheel and the axle circumference: one revolution of each is involved regardless of the source of the force...the circumference of the wheel is many times that of the axle...the wheel circumference always moves a much longer distance than the axle circumference...assuming they are rigidly connected.
 
And by the way, wheels usually turn on axles...that is they are not rigidly connected so maybe thinking of different size gears might eliminate any confusion...Remember in the old cowboy movies when the wagon wheels were removed and grease applied between the wheel and axle??
 

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