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# Measuring the charge on a polythene rod.

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Introduction

Physics Coursework Hayley Fairhurst 11R Measuring the charge on a polythene rod. Planning The variables that could affect my investigation are the amount of times the polythene rod is rubbed, the size of the paper and the height the rod is held from the paper. In my investigation I am going to change the variable of the amount of times the polythene rod is rubbed. To see how the amount of times the polythene rod is rubbed affects my investigation I am going to record how many bits of paper the polythene rod picks up after each different amount of rubs. I think that the more times the polythene rod is rubbed, the more pieces of paper it will pick up. I think this will happen because as the polythene rod is rubbed with the cloth, the cloth atoms will loose electrons so therefore become positively charged. The polythene rod will have collected the electrons from the cloth so therefore become negatively charged. ...read more.

Middle

I will keep the paper the same size throughout my investigation and also use the same amount of paper. I will hold the polythene rod at the same height above the paper for each amount of rubs and I will discharge the polythene rod after each amount of rubs by using the Bunsen burner. I will make my plan safe by taking care with the Bunsen burner and when it is not in use make sure that it is on the safety flame. Results of first experiment Amount of rubs Amount of paper picked up Total mass of paper picked up 10 28 0.07 20 52 0.13 30 68 0.17 40 77 0.1925 50 74 0.185 Results of second experiment Amount of rubs Amount of paper picked up Total mass of paper picked up 10 32 0.08 20 67 0.1675 30 75 0.1875 40 72 0.18 50 76 0.19 Results of third experiment Amount of rubs Amount of paper picked up Total mass of paper picked up 10 30 0.075 20 62 0.155 ...read more.

Conclusion

Evaluating Results I think my results were accurate because I carried out three investigations on each amount of rubs and then done the averages of all three for each amount of rubs. I think my results were also reliable because I done the averages for each amount of rubs and my results matched my prediction and the science explanation. None of my results were anomalous results because they all fitted a pattern. I think my plan was suitable because I did not have to change anything about it and it gave me the right results. Also I stated everything in my plan for example how I would keep it a fair test and all the equipment that I needed. To make my investigation work better next time I would have my results tables already drawn out before I started my investigation so that I could record my results in it quickly whilst doing my investigation. This would enable me to carry out the practical part of my investigation quicker than I did. Diagram ...read more.

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