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# Young Modulus watch

1. As stated in the title could someone please explain to me what this mean?
I know it is measured by stress/strain but i have no idea what it actually is. I was doing some physics past papers and came across this but my teacher hasnt taught me this yet, and how would you describe an experiment to determine young modulus of steel in the form of a wire?
2. The Young Modulus is defined as the ratio of the tensile stress and the tensile strain
in a lay man's term its the measure of a materials stiffness, how much force a material cantake before it breaks

Experiment:
as for the experiment here is a link that will help... just replace copper with steal.

Hope this helps
3. (Original post by 0zero0)
The Young Modulus is defined as the ratio of the tensile stress and the tensile strain
in a lay man's term its the measure of a materials stiffness, how much force a material cantake before it breaks

Experiment:
as for the experiment here is a link that will help... just replace copper with steal.

Hope this helps
oh ok so if i pull a string the original length and the length just before it snaps is young modulus? its very confusing
And there isnt a link if you dont mind providing the link to me again. Thanks
4. (Original post by JBKProductions)
oh ok so if i pull a string the original length and the length just before it snaps is young modulus? its very confusing
on a graph the young modulus can be found by finding the gradient from the point of origin which is zero upto the limit of proportionality, the point it breaks....basically the gradient of the straight line in your graph gives you the young modulus
5. not exactly.
6. (Original post by 0zero0)
on a graph the young modulus can be found by finding the gradient from the point of origin which is zero upto the limit of proportionality, the point it breaks....basically the gradient of the straight line in your graph gives you the young modulus
Thanks for explaining how to find it but im still not sure what it actually is. Is it just the maximum force something can handle and if you put anymore force on it, it breaks?
7. (Original post by teachercol)
not exactly.
How would you explain what it is? i really need to know what it is
8. E = Young Modulus = Stress/Strain = (Force exerted on wire/Area of the Wire) / (Extension/Original Length of Wire)

units in Pa

materials with high E are stiff
9. (Original post by msd2008)
E = Young Modulus = Stress/Strain = (Force exerted on wire/Area of the Wire) / (Extension/Original Length of Wire)

units in Pa

materials with high E are stiff
oh ok so the higher the E the easier it is to stretch? and the lower it is the harder it is to stretch
10. no its the other way round.

higher E means it requires more force to be stretched. lower E means it is easier to stretch.
11. (Original post by msd2008)
no its the other way round.

higher E means it requires more force to be stretched. lower E means it is easier to stretch.
oh ok and btw would that be an acceptable definition for young modulus or no?
12. i would say 'Young Modulus is a measure of the stiffness of a material and is calculated by stress/strain.'
13. (Original post by msd2008)
i would say 'Young Modulus is a measure of the stiffness of a material and is calculated by stress/strain.'
ok thanks for helping me im soo glad i know it now lol my teacher hasnt even taught us it yet and exams are in jan im getting scared lol.
14. np. good luck for jan. i'm retaking the module with this topic in it.
15. (Original post by msd2008)
np. good luck for jan. i'm retaking the module with this topic in it.
oh good luck to you too and i hope we both get the results we want

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