hooke law
- Created by: ilovegilmoregirlsandhotchoco
- Created on: 18-01-22 16:24
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- hookes law
- when a helical spring is loaded,it streches
- the natural lengh is the normal lengh of the spring without a load on it
- the differnece between the extended and natural lengh is the extension
- the extended lengh is the lengh of the spring when loaded
- extension=extended lengh - natural lengh
- the differnece between the extended and natural lengh is the extension
- the extended lengh is the lengh of the spring when loaded
- definition of hookes law
- extension is proportional to the load,provided the proportional limit is not exceeded
- what does the last part of hooks law mean?
- springs are not invincable
- at some point,you will add too much force that it will not be able to return to its orignial shape
- we can this point the elastic limit
- the elastic limit on the graph is easy to spot as it is he point that the line will begin to curve
- because the line is no longer straight,it means f and e are no longer directly proportional,so hooks law is no longer obeyed
- the elastic limit on the graph is easy to spot as it is he point that the line will begin to curve
- we can this point the elastic limit
- at some point,you will add too much force that it will not be able to return to its orignial shape
- springs are not invincable
- what does the last part of hooks law mean?
- extension is proportional to the load,provided the proportional limit is not exceeded
- hookes law states that the extension of the spring,e, is directly proporational to the load,f
- eqaution
- f=k x e
- f=force/load applied to the spring(N) k=the spring constant (N/cm of N/m) e=extension (cm or m)
- if k is large the spring is stuff,if k is small,the spring is easy to extend
- the spring consant can be caulculated using th graph with k=f divided by e
- f=k x e
- eqaution
- when we plot a force extension graph(f-e) we see two features
- 1.the line goes through the origin(0,0)
- these feautures tell me that the force,extension and variables are DIRECTLY PROPORTIONAL
- 2.the line is straight
- these feautures tell me that the force,extension and variables are DIRECTLY PROPORTIONAL
- 1.the line goes through the origin(0,0)
- when the spring reached its elastic limit it no longer obeys hookes law
- in the regin where the line is straight on the graph,the spring shows elastic behavoiur
- this means that when the load is removed the spring goes back to its orignial lengh
- if a load more than 7 (see pg 27) is applied to the spring,it goes beyond its elastic limit and so changes its shape permenantily
- when the load is removed,the spring does not return to its orignial shape
- this is called plastic deformation
- when the load is removed,the spring does not return to its orignial shape
- if a load more than 7 (see pg 27) is applied to the spring,it goes beyond its elastic limit and so changes its shape permenantily
- this means that when the load is removed the spring goes back to its orignial lengh
- in the regin where the line is straight on the graph,the spring shows elastic behavoiur
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