Hookes law experiment help

  • Thread starter rons49
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  • #1
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im having bother writing the conlcusion for hookes law experiment, can any one help or point me in the right direction ????
 

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  • #2
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What is hookes law? Are there limitations of hookes law?
 
  • #3
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hooke's law states that spring extension is in direct proportion to the load applied, within the elastic limit of the spring F = KX

F is the force applied to the spring in newtons (N)
k is the spring constant measured in newtons per meter (N/m)
x is the distance the spring is stretched from its equilibrium position in meters (m)
 
  • #4
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so now relate that definition of hooke's law to your hypothesis and your observations. Mention its limitations.
 
  • #5
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Analyse the relationship between the conclusion drawn from your data and Hooke's law to verify its validity. Also, is there any anomalies? Do they indicate limitations of Hooke's Law?
 
  • #6
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I recently finished my first course in mechanics (or maybe I should call it physics course A, however...) but we also talked a bit about Hooke's Law. Unfortunately my teacher wasn't a "real" teacher in physics (actually he was a teacher of Mechanical engineering) and it doesn't look like we learnt the "real" Hooke's law, can anyone explain to me what this is then in simple terms?:

σ = Eε

My teacher told us that this (^) was hooke's law. A quick look on wikipedia shows F=-kx, but also I can find σ = Eε if I scroll down a bit.

I know that sigma is the stress caused on a certain area (like the area of the cable holding up an elevator), E is the elastic modulus of a certain material, and epsilon, umm I don't know the word for it in english but I know what it is. :)

Thanks in advance.
 
  • #7
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F = -kx is an equation of motion. Your σ = Eε seems to be more of a definition of materials.
 
  • #8
nasu
Gold Member
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I recently finished my first course in mechanics (or maybe I should call it physics course A, however...) but we also talked a bit about Hooke's Law. Unfortunately my teacher wasn't a "real" teacher in physics (actually he was a teacher of Mechanical engineering) and it doesn't look like we learnt the "real" Hooke's law, can anyone explain to me what this is then in simple terms?:

σ = Eε

My teacher told us that this (^) was hooke's law. A quick look on wikipedia shows F=-kx, but also I can find σ = Eε if I scroll down a bit.

I know that sigma is the stress caused on a certain area (like the area of the cable holding up an elevator), E is the elastic modulus of a certain material, and epsilon, umm I don't know the word for it in english but I know what it is. :)

Thanks in advance.
The σ=Eε is the general Hooke's law. It may be applied to any piece of elastic material, of any shape. In general all terms are tensors. For the simple case of a bar pulled by the ends with a force F , σ is the force per unit cross section area and ε is the relative elongation.
E is a material constant (Young's modulus).

F=-kx applies to a spring or any elastic object. Here k is a constant of the object and not of just the material. Springs made from the same material may have different values of k, depending on size and shape.
 
  • #9
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Ahhh! Thanks nasu for the good explanation, also I've noticed these "physic" words differ a lot from language to language :b however, big thanks!
 

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