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Bouncing A Squash Ball Lab Report - Abhirath Singh

Extracts from this document...

Introduction

                                                                                                                       Abhirath Singh
                                                                                                                      0434

Bouncing A Squash Ball Lab Report

Aim: To investigate the effect of temperature on the bouncing capacity of a squash ball.

Hypothesis: The bouncing capacity of the ball and its temperature are directly proportional. This means that as the temperature increases, so does the bouncing capacity of the ball.

Background: A squash ball is an elastic solid, which returns to its original shape, after being acted on by a force. Therefore, it is hard to bounce a squash ball, as on collision, the ball loses its shape, as the air inside it allows the ball to lose its shape. In this experiment, we will attempt to find to find the effect of temperature on the bouncing capacity of a ball.

Apparatus:

  1. Squash Ball with one yellow dot– 1
  2. Tongs – 1
  3. Electronic Thermometer (± 0.1oC) – 1
  4. 500cm3 Beaker – 1
  5. Meter Rule – 1 meter – 1
  6. Electrical Stop Watch (± 0.1 seconds)
  7. Electronic Water Heater – 1
  8. Water – 1 liter

Variables: 

Constant – Time of ball in water, height from which the ball is dropped.

Independent – Temperature of water.

Dependent – Height of bounce.

Method:

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Middle

As soon as the stop watch indicates 2 minutes, use the tongs to remove the ball from the water and immediately place it at the top of the meter rule.Let the squash ball fall from the top, with no force applied by one’s hand.As the squash ball bounces on the ground, measure the height it bounces back by observing how high it bounces on the meter rule.Note this value down in a table.Now let the temperature of the water decrease by 10oC (+ 1oC).Repeat steps 3 to 11 for temperatures 55 oC, 45 oC, 35 o
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Conclusion

Errors:-

  • The duration taken to transfer the ball from the beaker to the point where we dropped the ball should have been the same for each try at each temperature. This way, the amount of energy lost before dropping the ball would have been the same.
  • At certain moments the ball might have not been completely submerged underwater.
  • The reading of the height the ball bounced back was not accurate, as the highest point of the ball is maintained only for a fraction of a second.

Modifications:-

  • The beaker with the ball could have been placed as close as possible to the wall where the meter rule was placed, in order to reduce the amount of time spent transferring the ball from the beaker to the meter rule.
  • The time take to transfer the ball from the beaker to it dropping position could have been restricted to 5 seconds, in order to equalize the amount of energy lost by the squash ball.
  • The ball could have been submerged underwater using to tongs, avoiding the possibility of the ball coming out of the water during the 2 minutes.

...read more.

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Here's what a star student thought of this essay

3 star(s)

Response to the question

The response to question is good – the lab report fulfils its purpose of informing the reader of the procedure and the results obtained. For this review I will diverge slightly from the standard structure – a lab report doesn’t ...

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Response to the question

The response to question is good – the lab report fulfils its purpose of informing the reader of the procedure and the results obtained. For this review I will diverge slightly from the standard structure – a lab report doesn’t lend itself to the question criteria used for most reviews. Overall it is a very good lab report – results are presented clearly, something important for lab reports. One thing that you should put in is how the errors affected results. Tell us what the ball not being completely submerged would do to the overall bouncing capacity. This is a very valuable aspect to do as it shows you understand the procedure and its errors.

Level of analysis

The level of analysis is very good – as mentioned above, results are presented well showing the trend clearly. Analysis of errors is good, but could be improved as above. One error that should be noted however is that the hot water would inevitably change the temperature of the rubber. This means that you are changing the temperature of air inside (the primary factor that you consider your independent variable) but also the temperature of the rubber itself, which would have an inevitable effect on the bouncing capacity. This is a fundamental flaw in the procedure that should be addressed in the report. Furthermore, it is very difficult to determine the actual rebound height with the naked eye – you would be better off using a video then analysing frame by frame. This would lead to a much more accurate result.

Quality of writing

Having done this experiment myself, I would say ‘first rebound height’ instead of ‘bouncing capacity’. ‘Bouncing capacity’ is quite ambiguous as it does not inform us about what was actually measured. Linked to this, some language is a little imprecise – in the results table, ‘try’ should ‘trial’. This is standard in most scientific reports and sounds more professional than ‘try’. Overall, the report is very well written with good analysis. If the above suggestions were put in place, this could well be a 4* piece.


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Reviewed by davo11 20/02/2012

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