Elastic Modulus - Probably a dumb question but I can't do it

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SUMMARY

The discussion focuses on calculating stress and strain for an elastic band experiment to determine Young's modulus. The user, Sam, provided data including weight, length, and extension measurements. To compute stress (σ) and strain (ε), the formula σ = F/A is essential, where F is the force applied (weight) and A is the cross-sectional area of the elastic band. Young's modulus (E) is then calculated using the relationship E = σ/ε.

PREREQUISITES
  • Understanding of basic physics concepts, specifically stress and strain.
  • Familiarity with Young's modulus and its significance in material science.
  • Knowledge of the formula for calculating stress (σ = F/A).
  • Ability to measure or estimate the cross-sectional area of materials.
NEXT STEPS
  • Calculate the cross-sectional area of the elastic band to proceed with stress calculations.
  • Learn how to derive strain (ε) from the extension and original length of the elastic band.
  • Explore detailed examples of Young's modulus calculations in material science.
  • Investigate the effects of different materials on stress and strain behavior.
USEFUL FOR

This discussion is beneficial for physics students, engineering students, and anyone interested in material properties and elasticity calculations.

Gallows
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WEIGHT (kg) Length (m) How much it extended (m) STRESS STRAIN
0.1 0.11 0.4
0.2 0.13 0.6
0.3 0.18 0.11

I did an experiment in physics for youngs modulus, I need to workout the stress and strain on an elastic band with weights attached, but I have no idea how.

Could anyone please help me to workout the stress and strain from the data I got from the experiment and please explain how

Regards

Sam
 
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Gallows said:
WEIGHT (kg) Length (m) How much it extended (m) STRESS STRAIN
0.1 0.11 0.4
0.2 0.13 0.6
0.3 0.18 0.11

I did an experiment in physics for youngs modulus, I need to workout the stress and strain on an elastic band with weights attached, but I have no idea how.

Could anyone please help me to workout the stress and strain from the data I got from the experiment and please explain how

Regards

Sam

Ok, I'm guessing that your columns are respectively weight, length and how much it extended? Anyways to determine E (Young's modulus) we're going to have to know the cross sectional area of the specimen. E=sigma/epsilon so we need to calculate stress with the formula sigma=F/A. Anyways I'm just a first year eng student and I haven't learned much in my materials class yet but as far as I know you're going to need the cross sectional area
 

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