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  • Level: GCSE
  • Subject: Maths
  • Word count: 2574

Bouncing ball investigation.

Extracts from this document...

Introduction

Science course work

Section 1

Plan

Bouncing ball investigation

Brief investigation of investigation

This is an experiment to investigate bouncing balls and how they behave in different situations. Few independent variables will be changed, so the investigation is easy to manage, and the data is easier to process. The first independent variable that will be tested. The tennis ball is the constant variable factor (the variable that is kept the same, to make the investigation valid). The ball will dropped from increasing heights (cm-25, 50, 75,100,125,150,175,200) and the bounce of the ball will be measured. A sample size of 3 results will be taken from each height the ball is dropped. The same investigation will then be repeated, but one of the independent variables will be changed. This will be the surface material the ball is dropped on. To make the test fair the same people will carry out the same task each time the ball is dropped e.g. the same person drops the ball. The results from the two investigations will then be compared.

Risk assessment
There are not many risks from dropping a ball but safety must be considered. The ball should not be thrown, and the person dropping the ball should not stand on chairs or tables.

Independent variables
There are many independent variables (which can also be called the manipulated variable- the variable that is varied in the investigation)

...read more.

Middle

Diagram of equipment

image03.png

Fair test

To ensure the tests are fair many aspects must be considered especially how particular things will affect the dependent variables.

-The ruler will always be fixed to the retort stand

-The same person will always drop the ball

-The same people will always observe where the ball bounces and record the results.

-The ball will be bounced three times at each height to ensure there are no rogue or anomalous results.

-Ensure the carpet surface is stable and flat, the carpet surface must also be fixed so it does not move.

Number and range of observations

Three readings will be taken at each height. The heights will increase at 25cm; the starting height will be 25cm then 50cm, 75cm, 100 cm, 125cm, 150cm, 175cm and 200cm. To ensure the accuracy of the results when averaging them any rogue or inconsistent results will be taken again.

Section 4

Information from secondary and preliminary work

To ensure the investigation that I carried out was correct and what variables had to be considered. The Internet was used to collect more information. There were many people who had also done something similar to the bouncing ball experiment. There was also an experiment that was carried out with Mr Boye before the investigation. From the first experiment there were many mistakes that I learnt to avoid in the bouncing balls experiment.

...read more.

Conclusion

Reliability of evidence

The data and graphs that were constructed or collected, should be very reliable, as much of the planning stage was done to ensure all data was consistent the same results should occur if the investigation were to be carried out again.

Anomalous results

All anomalous results that occurred during the investigation were taken again, until the result appeared to be consistent

Support for a firm conclusion

The results that were taken were consistent, in that no anomalous results were recorded and the graphs appeared to be consistent and showed the efficiency well.

Improvements to the method

Different weights or mass, temperature of the ball, using a hollow ball against non hollow ones- which one bounces better, change in ball material,

If the investigation were to be carried out again, some extra apparatus could be used to record different aspects of the bouncing ball. A light gate could be set up to record the speed of going down and the speed when it bounces back up.

The accuracy could have been improved with the use of a digital camera, which could be used to find the exact height the ball bounced; this could be done by replaying the bounce frame by frame.

The investigation should be done in a more controlled environment, to see if room temperature affects the bounce of the ball.

The results will not be completely accurate or precise due to the fact the investigation was not performed in a completely controlled environment, e.g. ball temperature, room temperature.

Additional evidence

...read more.

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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