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• Level: GCSE
• Subject: Maths
• Word count: 2395

# Chrunchie-bone replacement Investigation.

Extracts from this document...

Introduction

Steve Lansdowne

Chrunchie-bone replacement Investigation

## Investigation

During this experiment I wish to expand my knowledge of how bones within the body are damaged or effected at all by a force and how much force is needed to take an effect I will be using a crunchie bar to take the place of the bone as they are structurally very similar- a honey comb style.

I will be testing:

• Different weights acting on crunchie and effect on compression
• Surface area (size of face touching base and weight)
• Height of material
• Effect of removing chocolate coating of crunchie

## Equipment

• 1kg weights
• Micrometer
• Vernier calliper
• 2 pieces of hardboard
• 3 crunchie bars
• Knife
• Stop watch

## Method

For this experiment I will firstly cut the required piece of crunchie bar to size making sure it is very precise and flat edges so no gaps etc in the side. Remove any chocolate if necessary this must be done very carefully and no chocolate left, again leaving flat edges with no broken ends or split edges.

Then before any weight is added the piece must be accurately measured using the micrometer which is accurate to milli meters and a small scale venire calliper. This is recorded so three measurements will be produced, width, length and height.

Middle

18

18

10

7

10

3

18

18

10

8

10

3

18

18

10

9

Crumbled

3

From this experiment it can be derived that the maximum weight before collapsing is around 9kg whether the chocolate is on or off, and the actual compression is very minimal, only around 3mm. So for my future experiments I shall use 2kg weight each time.

Experiment 2

In these experiments I have tested the effect of different surface areas on compression I have left the chocolate on for these experiments.

 Width (mm) Length (mm) Height (mm) Mass (kg) New Height (mm) Compression (mm) 20 30 15 2 15 0 20 30 15 4 15 0 20 30 15 6 14.8 0.2 20 30 14.8 8 14.5 0.5 20 30 14.5 10 14 1 20 30 14 12 13.9 1.1 20 30 13.9 14 Crumbled 1.1 Width (mm) Length (mm) Height (mm) Mass (kg) New Height (mm) Compression (mm) 10 10 15 2 14.5 0.5 10 10 14.5 4 14 1 10 10 14 6 13.5 1.5 10 10 13.5 8 Crumbled 1.5 Experiment 3

Conclusion

The equipment used was only accurate to 1dp using human judgement, which is not 100% reliable a lot of the time compression was such a small amount readings to an extent would have to be guessed, if the reading was taken at a slight angle then with this equipment would change the result due to lack of time some of the readings were rushed and so this mistake may have been made.

Ways to improve:

• Use a material such as a high quality sponge that had equal aeration throughout and then aeration differences could also be investigated. The material would also have to be quite durable so that was not effected by handling – a resistant outer shell.
• Use high tech computerised equipment accurate to 2dp or more maybe a computer program to record results and draw graphs so these would be clearer. This would lessen the possibility of human error as in experiment 3.

This student written piece of work is one of many that can be found in our GCSE Height and Weight of Pupils and other Mayfield High School investigations section.

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