Need to demonstrate 44 Newtons of force

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Discussion Overview

The discussion revolves around demonstrating a force of 44 Newtons, specifically in the context of the Sellick's maneuver used in medical practice. Participants explore various methods to visualize or replicate this force in a lecture setting, considering both practical and educational approaches.

Discussion Character

  • Exploratory
  • Technical explanation
  • Homework-related

Main Points Raised

  • One participant seeks a standardized way to demonstrate the force of 44 Newtons required for the Sellick's maneuver, equating it to approximately 10 lbs or 4.5 kg.
  • Another participant suggests using a 10 lb dumbbell or plate as a straightforward method to represent the force.
  • A different approach proposed involves creating a lever that requires 10 lbs of force to demonstrate the effort needed.
  • Questions arise about the relationship between pulleys and levers, with one participant inquiring if a pulley can serve the same function as a lever for demonstrating the force.
  • One participant mentions the idea of using a top-loading scale to measure the force directly.
  • Clarification is provided that a fixed pulley does not change the magnitude of the force, only its direction.

Areas of Agreement / Disagreement

Participants present multiple competing views on how to demonstrate the force of 44 Newtons, with no consensus reached on a single method. Various suggestions are offered, indicating a range of possible approaches.

Contextual Notes

Some participants express uncertainty regarding the mechanics of pulleys and levers, and there are unresolved questions about the effectiveness of different demonstration methods.

Who May Find This Useful

Medical professionals, educators in physics or anatomy, and anyone interested in practical demonstrations of force in a medical context may find this discussion relevant.

stephejo
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I hope someone can help me.

I am a medical doctor and need to have a standardized way to demonstrate the force needed to press on the front of the cricoid ring of the larynx (neck) in order to occlude the esophagus (Sellick's maneuver) with the patient lying supine... so the thumb and forefinger press on the front of the neck with 44N.

The studies specify 44 Newtons. How much is that. Looks to me like 10lbs or 4.5kg on earth.

Is there an easy model that I can make and pass around the lecture room to show what about 44N "feels like"??

Thanks.
 
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Why not just get a 10 lb dumbbell? Or a 10 lb plate for a barbell set?

If you want to have fun, make a lever that requires 10 lbs of force to depress--then students can see just how hard they must push with thumb and forefinger.
 
It's been a long time since college physics... is a simple pulley the same as a lever? If I make a pulley with 10lb and pushing down the end of the pulley the same thing?

Thanks!
 
My first thought was to use some sort of top loading scale. Maybe like this.
4724_100X100.jpg
 
stephejo said:
It's been a long time since college physics... is a simple pulley the same as a lever? If I make a pulley with 10lb and pushing down the end of the pulley the same thing?
Sure, that would work. (There are a zillion ways to go.)
 
Perfect idea.

Thanks!
 
stephejo said:
It's been a long time since college physics... is a simple pulley the same as a lever? If I make a pulley with 10lb and pushing down the end of the pulley the same thing?

Thanks!
Fixed pulley, yes. Fixed pulley does not change the force magnitude. Only direction.