Calculating Force Using Young's Modulus

Click For Summary

Homework Help Overview

The discussion revolves around calculating force using Young's modulus in the context of a physics problem. Participants are exploring the relationships between stress, strain, and Young's modulus, while attempting to derive the force from given parameters.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss the relevant equations for stress and strain, and how they relate to Young's modulus. There is an exploration of how to rearrange these equations to isolate force. Some participants express uncertainty about the specifics of the question and the values needed for calculation.

Discussion Status

There are multiple interpretations of the problem, with participants sharing their calculations and comparing results. Some guidance has been offered regarding the importance of presenting the problem statement clearly and checking for potential errors in calculations, such as misplaced decimal points.

Contextual Notes

Participants mention that the homework assignment includes material not yet covered in class, which may contribute to confusion about the problem setup and calculations.

chriscarson
Messages
197
Reaction score
26
Homework Statement
Calculating Force when having the area .
Relevant Equations
How can you Calculate Force ?
How can you Calculate Force ?
 
Physics news on Phys.org
I'm not sure what the question is specifically. We have ##\sigma = \frac{F}{A}## and ##\varepsilon = \frac{\Delta L}{L}##, along with the definition of Young's modulus, ##E = \frac{\sigma}{\varepsilon}##.

You can put these into one expression, namely ##E = \frac{FL}{A\Delta L}##.
 
  • Like
Likes   Reactions: chriscarson
etotheipi said:
I'm note sure what the question is specifically. We have ##\sigma = \frac{F}{A}## and ##\varepsilon = \frac{\Delta L}{L}##, along with the definition of Young's modulus, ##E = \frac{\sigma}{\varepsilon}##.

You can put these into one expression, namely ##E = \frac{FL}{A\Delta L}##.

the question is to find the force
 
chriscarson said:
the question is to find the force

So are you after ##F = \frac{AE\Delta L}{L}##?
 
  • Like
Likes   Reactions: chriscarson
etotheipi said:
So are you after ##F = \frac{AE\Delta L}{L}##?

well i have all those values so i can give it a shot , although our teacher give us homework that we didi nt had lesson on ,
thanks
 
was very close the teacher s answer was 981N mine was 9812.5N
 
chriscarson said:
was very close the teacher s answer was 981N mine was 9812.5N
That's what's called being out by a factor of ten. Can you find the reason for it?
 
  • Like
Likes   Reactions: chriscarson
PeroK said:
That's what's called being out by a factor of ten. Can you find the reason for it?

i know you can round it to 3 significant figures but nothing about factor of ten.
 
chriscarson said:
i know you can round it to 3 significant figures but nothing about factor of ten.

You should post your calculation along with a statement of the problem. My guess is you've misplaced a decimal point somewhere.
 
  • Like
Likes   Reactions: chriscarson
  • #10
PeroK said:
You should post your calculation along with a statement of the problem. My guess is you've misplaced a decimal point somewhere.

ok it seems it s important to write the problem
 

Similar threads

Confusion Calculating Young's Modulus
  • · Replies 5 ·
Replies
5
Views
2K
Calculating Young's Modulus from this Stress/Strain Graph
  • · Replies 29 ·
Replies
29
Views
8K
Correct statement about size of wire to produce larger extension
  • · Replies 18 ·
Replies
18
Views
2K
Determine equivalent Young's Modulus
  • · Replies 17 ·
Replies
17
Views
4K
Equation Alternatives for Young's Modulus
  • · Replies 14 ·
Replies
14
Views
2K
Young's Modulus and the Poisson Ratio of Aluminium
  • · Replies 1 ·
Replies
1
Views
2K
Young's modulus — Finding the change in the length of a metal bar under stress
  • · Replies 20 ·
Replies
20
Views
3K
Is the Young's Modulus Equation Homogeneous?
  • · Replies 7 ·
Replies
7
Views
5K
Young's modulus question with answer notation issue
  • · Replies 19 ·
Replies
19
Views
2K
Why is length independent of young modulus ?
  • · Replies 2 ·
Replies
2
Views
2K