# Hookes law

by rons49
Tags: hookes
 P: 2 im having bother writing the conlcusion for hookes law experiment, can any one help or point me in the right direction ????
 P: 1,084 What is hookes law? Are there limitations of hookes law?
 P: 2 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)
 P: 1,084 Hookes law so now relate that definition of hooke's law to your hypothesis and your observations. Mention its limitations.
 P: 351 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?
 P: 112 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.
 P: 1,084 F = -kx is an equation of motion. Your σ = Eε seems to be more of a definition of materials.
P: 1,970
 Quote by RobinSky 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.
 P: 112 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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