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# What affects the stretch of a string

Free essay example:

What affects the stretch of a spring?

## Planning

Key factors- These are the things that vary and could affect my results. In this experiment they are-

• The length of the spring- I would expect that a longer spring would have a longer extension then a shorter spring, so the length of the spring would affect the stretch of a spring.
• The amount of weight added- I would expect, the more weight added to the spring, the longer the length of the extension, which would affect the stretch of a spring.
• The material of the spring- I would expect that different metals or different alloys used could be at different weights, which would affect the stretch of a spring.
• The diameter of the spring- I would expect that the greater the diameter of the spring the longer the extension of the spring, because it may have bigger corals in the spring, which would affect the stretch of a spring.

## Aim- For thisinvestigation I am going to find out how the weight added to the spring affects the spring’s lengths and extension. This is what the extension is-

10 mm

1 N

### Fair test- For this experiment to make it a fair test I will only change the weight added to the spring. The things that will be kept constant will be-

• The length of the spring
• The material of the spring
• The diameter of the spring

This will keep them constant by using the same spring.

Prediction- My prediction for this experiment is that if you double the weight added, the extension will double, if you treble the weight, the extension will treble and so on. These all mean the extension is directly proportional to the load. This will all work until the spring reaches it elastic limit when the spring has broken and does not return to its original length. I have put my prediction as this as I have got this from Hooke’s Law reference page eight on ‘Focus on Science’. I also predict that if enough weight is added, the spring will reach its elastic limit and break, or not return to its original length.

Apparatus- These are the apparatus that I will be using for this experiment-

• A spring
• A ruler (half meter)
• A stand
• Weights
• Clamp

Spring

Stand

Weight

Ruler

### Method

First I will set-up the apparatus as shown in the diagram. I will then add one weight  (1 Newton) to the spring and record the extension. I will then take the weight off and see if the spring has returned to its original length. I will then carry on this procedure up to 6 weights, (6 Newtons) recording the extension, and seeing if the spring is at its original length for each weight (Newton.) I will then plot the results of the experiment into a graph.

Safety

For this experiment I will be following all the laboratory rules, and using the weights carefully, by adding the weights sensibly.

### Table 1

 Weight added in Newton Extension of spring in cm 0 N 0 cm 1 N 2.5 cm 2 N 6.5 cm 3 N 10.4 cm 4 N 14.2 cm 5 N 18.2 cm 6 N 22 cm

This was my first set of results, for what affects the stretch of a spring. I looked at these results and thought back to Hooke’s law, which tells me that if you double to weight added, the extension will also double. In these results I can see that it does not reflect back to Hooke’s law, so I must of done the experiment wrong. I decided to the experiment again. These are my new results.

 Weight added in Newton Extension of spring in cm 0 N 3.5 cm 1 N 7.2 cm 2 N 10.9 cm 3 N 14.6 cm 4 N 18.5 cm 5 N 18.5 cm 6 N 22.1 cm 7 N 26.8 cm 8 N 30.6 cm 9 N 34.5 cm 10 N 37.2 cm

I recorded the results for up to 10 Newton weights added. I then decided to see how many weights added until the spring reached its elastic limit, which was 13 Newton’s.

I knew the elastic limit had been reached because the spring did not return to its original length after 13 weights were added to the spring.

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