Thread: Need an experiment for Young modulus.

Hi to all,
I need a high school experiment to determine the young modulus of a wire. As stated in my syllabus 'describe an experiment to determine the young modulus of a metal in the form of a wire'
thanks in advance.

I had to look up the term. I'm amazed they teach you about this in Highschool.

http://en.wikipedia.org/wiki/Young%2...us#Calculation

Apparently the calculation is:



If I understand this right then it is simply how far the wire stretches when you pull on it. So I would think you could just measure the wire's length when it is not attached to anything, then hang the wire off of a table or something and attach a weight to one end and measure it again.

I'm not entirely sure if that's correct, though. It looks like what it means, but I might be missing something.

Originally Posted by kojax

I had to look up the term. I'm amazed they teach you about this in Highschool.

http://en.wikipedia.org/wiki/Young%2...us#Calculation

Apparently the calculation is:



If I understand this right then it is simply how far the wire stretches when you pull on it. So I would think you could just measure the wire's length when it is not attached to anything, then hang the wire off of a table or something and attach a weight to one end and measure it again.

I'm not entirely sure if that's correct, though. It looks like what it means, but I might be missing something.

That is pretty much it.

Your biggest problem will be getting a measurable amount of stretch in the wire. The smaller the diameter and the longer the wire, the more elongation you will get with a reasonable amount of force. You will need a micrometer to measure the diameter of the wire.

And if you measure the diameter in both the stressed and unstressed condition you can determine the Poisson ratio as well as the Young's modulus.

Thanx. But is there someone who has a great deal of knowledge about it.

your homework was just done for you and you're unsatisfied? The indignance...

Originally Posted by Adityasb

Thanx. But is there someone who has a great deal of knowledge about it.

try Timoshenko. The subject is called continum mechanics.

Anyway thankyou all for your replies. I got what i needed from this site- http://www.cyberphysics.co.uk/topics...ng_modulus.htm

It occurs to me that one should be able to measure Young's Modulus by recording the pitch change of a string instrument as various lengths of the string are wound around the tuning peg.

But I find myself quickly confused. Anybody steer me into clarity and information?