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# Physics Coursework: Air Break Investigation.

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Introduction

Physics Coursework: Air Break Investigation Prediction I predict that as I increase the number of vanes stuck into the cork, the mass on the end of the cotton string will take longer to reach the ground. I think that this will happen because I know that the more air resistance there is acting on a falling object, the quicker gravity and air resistance will balance and make the object reach its terminal velocity, therefore the object will fall at a slower speed thus taking longer to reach the ground. I also predict that as I increase the mass that is hung on the end of the cotton string, it will take less time to reach the ground. I think that this will happen because I know that the heavier an object is the longer it will take for gravity and air resistance to balance and for the object to reach its terminal velocity, therefore the object will fall at a faster speed thus taking less time to reach the ground. ...read more.

Middle

This is because the mass does not have enough time to reach its terminal velocity and will keep accelerating until it hits the ground. The results also show us that the more vanes are added to the air break, the longer the mass takes to hit the ground. This is because as more vanes are added, there is more air resistance acting on the air break. This means that it will take less time for the mass to reach its terminal velocity and it will hit the ground at a constant speed. One observation I made was that there was a big difference in time between when I used a 20g mass and when I used a 40g mass. I think that this is because when I used the 20g mass, gravity and air resistance were balanced almost as soon as I let the mass drop, so it reached its terminal velocity immediately and travelled at a constant speed from the top until it hit the ground. All of the graphs that I have produced show the same pattern. ...read more.

Conclusion

It is difficult to come up with an accurate and fair method to do this part of the experiment as other ways would also lead to some slight mistakes Also, the time that the mass took to reach the ground was measured by hand with a stopwatch. So the results are not totally accurate as my reflections are not accurate to a 100th of a second. I could get around this problem by using two light gates connected to a stopwatch. This would ensure that my results were accurate. Another way of improving the results would have been to do the experiment more than three times for each weight and number of vanes. This would have made my average more accurate therefore also making my graph more accurate. Ways of extending this investigation could be to investigate how using vanes of different sizes could affect the time that the mass would take to reach the ground. We could have also increased the height from which I dropped the mass. If we increased the height sufficiently this would have allowed me to find the terminal velocity of each mass. Name: Daniel Rios-Perez Form: 4M Set: 5 Daniel Rios-Perez ...read more.

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