Moments and force -- Forces on a cantilever hole punch

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Homework Help Overview

The discussion revolves around calculating the total force exerted by a single pin of a cantilever hole punch when a lever is pressed down with a specific force. The subject area includes concepts of moments and forces in mechanics.

Discussion Character

  • Exploratory, Assumption checking, Mathematical reasoning

Approaches and Questions Raised

  • Participants explore the relationship between the applied force and the resulting force on the paper, questioning how the number of holes punched affects the calculations. There are attempts to set up equations based on the lever arm and the force applied.

Discussion Status

The discussion is active, with participants offering various interpretations of the problem and attempting different equations. Some guidance has been provided, indicating that participants are on the right track, though no consensus has been reached regarding the final calculation.

Contextual Notes

Participants are navigating the implications of the number of holes punched and how that relates to the force calculations, with some uncertainty about whether to multiply certain values due to the dual hole punching action.

radaway
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Homework Statement


sam makes a punch hole with the perforater( two holes ). She presses the lever at A down with a force of 40 N. Calculate the total force which a single pin presses on the paper.

Homework Equations


http://s6.postimg.org/yx62wbild/image.png

The Attempt at a Solution


would it be :
40 N X 5 cm = 1,1cm X 'x' ?
 
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What about the two in the number of holes ?
 
<What about the two in the number of holes>
umm.. the perforater did what it normally needs to do. punch in 2 holes at the same time.
did you mean , I multiply the r.h.s of the equation with '2' ?
 
radaway said:
Calculate the total force which a single pin presses on the paper.
is what is asked for ...
 
Post edited to remove insult
How about --

40*(5+1.1)=(2f)*1.1 , thus f=... N.
 
Last edited by a moderator:
What's important is that you've got it ! (almost) all by yourself !
 

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