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    I just really don't understand the concepts of stiffness, toughness, elasticity and brittle in stress/strain graphs. How do I know when something is more/less brittle than another, and is stiffness just to do with the steepness of the line. Also, if the gradient is curved, is it more elastic than a straight line?
    Thanks!
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    stiffness is the ability of an object to resist extension when a force is applied to it. the higher the stiffness, the lower the extension when the same magnitude of force is applied to another material of a lower stiffness. stiffness is also the spring constant in hookes law.

    Think of a stress(y)-strain(X) graph. if the gradient is high, the object experiences a lot of force but doesn't extend much so it has a high stiffness.
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    (Original post by BTAnonymous)
    stiffness is the ability of an object to resist extension when a force is applied to it. the higher the stiffness, the lower the extension when the same magnitude of force is applied to another material of a lower stiffness. stiffness is also the spring constant in hookes law.

    Think of a stress(y)-strain(X) graph. if the gradient is high, the object experiences a lot of force but doesn't extend much so it has a high stiffness.
    Thank you! Can you please explain how I know if a material is ductile/ plastic?
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    physics exams are over tho
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    (Original post by aceplayyt)
    physics exams are over tho
    aqa alevel hasn't even started

    people sit different exams you know
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    (Original post by BTAnonymous)
    aqa alevel hasn't even started

    people sit different exams you know
    oh rip thought all the boards were on the same date
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    (Original post by aceplayyt)
    oh rip thought all the boards were on the same date
    Yup, i have all 9 exams this june.
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    (Original post by aceplayyt)
    physics exams are over tho
    Haha no this is an internal for my first year, I'm takingg the full A level( it's bloody awful tho, at 100 minutes for 50 multiple choice and 1 long answer...
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    (Original post by BTAnonymous)
    Yup, i have all 9 exams this june.
    damn good luck Im lucky mine were split 5 in may and 5 in june
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    Ductile - Material will undergo a lot of strain for a very small amount of stress
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    (Original post by BTAnonymous)
    Yup, i have all 9 exams this june.
    9 exams!! Good luck!
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    (Original post by Thomas_Grimes_17)
    Ductile - Material will undergo a lot of strain for a very small amount of stress
    Thank you! Does the material have to have a bendy region? Like is it considered ductile/ plastic after the limit of proportionality is passed?
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    Yes! If something is ductile, it undergoes plastic deformation when it is drawn out.
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