• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month
Page
1. 1
1
2. 2
2
3. 3
3
4. 4
4
5. 5
5
6. 6
6
7. 7
7
8. 8
8

# An Investigation into Hooke's Law - The aim of this experiment is to find out if the amount of weight applied to an elastic or stretchable object is proportional to the amount the object's length increases by when the weight is applied.

Extracts from this document...

Introduction

Michael South                                Hookes Law

An Investigation into Hooke’s Law

Planning

The aim of this experiment is to find out if the amount of weight applied to an elastic or stretchable object is proportional to the amount the object’s length increases by when the weight is applied.

Since Hooke’s law is famous, and is used a lot, I have many resources and researchable information available to use. I took this from a website; http://www.efunda.com/formulae/solid_mechanics/mat_mechanics/hooke.cfm

“Robert Hooke, who in 1676 stated,

The power (Sic.) of any springy body is in the same proportion with the extension.

He announced the birth of elasticity. Hooke's statement expressed mathematically is,

where F is the applied force (and not the power, as Hooke mistakenly suggested), u is the deformation of the elastic body subjected to the force F, and k is the spring constant (i.e. the ratio of previous two parameters).”

The equation will be very useful in calculating the change in size, and for preparing my hypothesis. I took this from http://www.tiscali.co.uk/reference/encyclopaedia/hutchinson/m0021767.html.

 Elasticity (physics) In physics, the ability of a solid to recover its shape once deforming forces (stresses modifying its dimensions or shape) are removed. An elastic material obeys Hooke's law, which states that its deformation is proportional to the applied stress up to a certain point, called the elastic limit, beyond which additional stress will deform it permanently. Elastic materials include metals and rubber. However, all materials have some degree of elasticity.

Middle

Apparatus:

These are the equipment pieces id need to use:

• 30cm Ruler
• Spring with hooks at each end.
• Retort stand and clamp
• Varied Selection of weights
• Weight holder with hook at the end.

Method:

• Collect and set up apparatus as shown in diagram.
• Measure the spring’s original length.
• Place required amount of weight on weight holder
• Measure the spring’s new length.
• Record results in suitable table
• Remove weights and start experiment again with different amount of weights.

As a safety precaution I will ensure the spring is not stretched so much it could fly off and injure someone’s eye.

Hypothesis:

I predict that I will find that the more weight that is added, the greater the extension of the spring will be. The change in weight will be proportional to the change in the length of the spring. I think this will happen because the greater the mass (measured in Kilograms, or Kg for short) an object has the greater the weight (measured in Newton’s, or N for short) it will have. The force of gravity pulls the object toward the ground with greater force and speed the greater the mass it has. If an object is attached to an elastic or stretchable object, and left to hang freely, it will be pulled toward the Earth’s centre of gravity.

Conclusion

Human error would lead to inaccurate readings.If the measuring device was damaged, bent, or not calibrated correctly this would lead to inaccurate results.If the spring was oscillating, or vibrating this would lead to the measurements continuously changing.

I could make the experiment more reliable by making sure the spring was not moving or vibrating in any way during measuring. I could make sure I measured from the same angle (as close as I can get to the same angle each time) to rule out parallax errors. I would make sure that the measuring device was intact, calibrated correctly and/or straight before use. I would also ensure that my spring was not damaged in any way, with the use of a magnifying glass or other enhanced viewing apparatus. I did not encounter any anomalous results in this experiment.

I believe that this method was the most appropriate as there aren’t any ways of measuring a spring’s extension that differs greatly from this experiment. I have gained enough evidence from this experiment to support my conclusion.

To gain further knowledge and evidence for Hooke’s law, an experiment where multiple springs are used, and elastic bodies made from different materials than metal, for example, an elastic band are used to see if Hooke’s law works in differing circumstances.

This student written piece of work is one of many that can be found in our AS and A Level Waves & Cosmology section.

## Found what you're looking for?

• Start learning 29% faster today
• 150,000+ documents available
• Just £6.99 a month

Not the one? Search for your essay title...
• Join over 1.2 million students every month
• Accelerate your learning by 29%
• Unlimited access from just £6.99 per month

# Related AS and A Level Waves & Cosmology essays

1. ## The aim of this investigation is to examine the effect on the spring constant ...

be run three times and the results of each experiment run averaged together at each increment to reduce experimental error. The averaged results at each interval will then be used to plot a graph of the extension in relation to the force applied.

2. ## Experiment B11: Measuring focal length of lenses

the graph to get some readings for further calculation, and then only the mean focal length of the combined lens is found. The focal length of the convex lens and that of the combined lens are used to find the focal length of the concave lens afterwards.

1. ## Hooke's Law

This extension is measured in N/m (Newtons per Metre) the figure for this is the amount of Newtons that would have to be added to the spring in order for it to have an extension of 1metre. Amount Of Weight Applied (N) Spring Extension (mm) 1 0 2 39 3 80 4 115 5 150 6 181 7 217

2. ## Investigating Hooke's Law

Also I will go up in equal increments so that when I work out extension according to Hooke's law the extension should be equal more or less throughout the investigation. I will also be repeating my investigation because by having to sets of results I wish to find an average to increase the reliability of the results.

1. ## Testing Hooke's Law

Extension (mm) Length (mm) Extension (mm) Length (mm) Extension (mm) Length (mm) Extension (mm) 0 0 100 0 100 0 100 0 100.00 0.00 100 0.1 100 0 100 0 100 0 100.00 0.00 200 0.2 100 0 100 0 100 0 100.00 0.00 300 0.3 100 0 100 0 100 0 100.00 0.00 400 0.4

2. ## An investigation into the behaviour of springs inparallel when a mass is applied.

From my preliminary experiment I found that:- 210g causes the length of 1 spring to increase to 103mm from 20mm. 210g causes the length of 6 springs in parallel to increase to 30mm from 20mm. So therefore I chose the mass of the load to be 210g, as this mass

1. ## An Investigation into the Factors, which affect the Voltage Output of a Solar Cell

My prediction is based on my scientific knowledge because if the solar cell's area is decreased by half then the light which contains packets of energy known as photons will only be able to strike half the solar cell. Hence producing only half the out put voltage a whole solar cell area would produce.

2. ## Waves and Cosmology - AQA GCE Physics Revision Notes

According to this theory, a massive object finds it harder to move due to its strong interaction with the particles in the Higgs field that fills space (Higgs bosons). * Only 4% of the matter in the universe has been accounted for.

• Over 160,000 pieces
of student written work
• Annotated by
experienced teachers
• Ideas and feedback to
improve your own work