Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Young modulus

  1. Jan 5, 2010 #1
    I simply do not understand what the young modulus is.

    Help on properties of solids such as ductility and malleability would help!
  2. jcsd
  3. Jan 5, 2010 #2

    Physics Monkey

    User Avatar
    Science Advisor
    Homework Helper

  4. Jan 6, 2010 #3
    I am currently doing A level physics. I do not understand searle's apparatus.

    I do not understand the significance of young modulus.
  5. Jan 6, 2010 #4
    It's just a ratio of the tensile stress/strain. Its kind of like a measure of the wire's stiffness.

    The tensile stress is the force that is applied, perpendicular to the wire's cross section. The strain is simply the amount the wire extends by (beyond its natural length) divided by its natural (original) length.
  6. Jan 6, 2010 #5


    User Avatar
    Staff Emeritus
    Science Advisor

    I'm somewhat puzzled here. One know about a Searle's apparatus, but one does not understand it's function? Is this not covered in class or in one's textbook?

    There is a relevant discussion here - http://en.wikibooks.org/wiki/A-level_Applied_Science/Choosing_and_Using_Materials/Properties

    Young's modulus is the coefficient that represents the amount of stress per unit strain when a material is 'elastically' deformed. The elastic range proceeds from no load (0 stress) to the 'yield stress'. When a material yields, it undergoes plastic (permanent) deformation.

    Ductility relates to the elongation or stretching (under a tensile load) without breaking. The greater the material, the more ductile it is.

    Malleability is somewhat related, but it has to do with the ability of a material to be deformed under compression without breaking or cracking.

    Please refer to - http://en.wikipedia.org/wiki/Ductility


    Please read one's textbook.
  7. Jan 7, 2010 #6
    I have, but you see, it does not go into any depth, there is simply a picture of it, not even a lebelled one. Furthermore, 'one's school is horrible, they don't actually teach anything here, so i have not done the experiment.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook