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Investigating the stretching of a material

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Introduction

Investigating the stretching

of a material

AIM: I am trying to find out what factors effect the stretching of a spring.

Things, which might affect this, are:

· Downward force applied to spring and elastic band.

· Spring material.

· Length of spring and elastic band.

· Number of coils in spring.

· Diameter of spring band material.

· Cross sectional area of spring.

I have chosen to look at the effect of the weight applied, as it is a continuous variation.        

PREDICTION: I predict the greater the force applied to the spring or elastic band, the further it will stretch. This is because extension is proportional to load and so if load increases so does extension and so stretching distance. I will also work out the extension which is done by taking away the extended length from the original length. In order to see if my prediction was correct, I will use Hooke’s Law. (-Robert Hooke (1635-1703), English scientist, best known for his study of elasticity. Hooke also made original contributions to many other fields of science.)

...read more.

Middle

  spring (all measurements in mm) image01.png

band (all measurements in mm) image02.png

Graphs:

PREDICTION: I predict the greater the force applied to the spring or elastic band, the further it will stretch. This is because extension is proportional to load and so if load increases so does extension and so stretching distance. I will also work out the extension which is done by taking away the extended length from the original length. In order to see if my prediction was correct, I will use Hooke’s Law. (-Robert Hooke (1635-1703), English scientist, best known for his study of elasticity. Hooke also made original contributions to many other fields of science.) He said that extension is proportional to the downward force acting on the band, and there will be a elastic limit where the band and the spring can’t take no more and will constantly drop and with the band it will actually break.

Detailed Method: My method of experimentation will be to use a clamp stand and boss clamp to suspend a spring from.

...read more.

Conclusion

Results Table

spring  (all measurements in mm)                                                                                 image03.png

band (all measurements in mm)  image04.png

These results are also plotted on a graph below.

The principle of Hooke’s Law can be seen in a graph of spring extension.

1. At this point the limit of proportionality has been reached this is where Hooke’s law is no longer accurate.

2. This point is the spring’s elastic limit if the force is removed from the spring it will no longer return to its original shape.

Beyond this point the atoms in the spring material begin to break their bonds until eventually the spring yields and breaks.

This shows that Hookes Law does have a limit as a spring does and does have limitations and if kept within these boundaries will provide reliable accurate results.

Mahmud Shahnawaz 11s-Science Ms welds-

...read more.

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