This is perfect for students in Year 13 to use to revise the AQA required practicals. All of the required practicals have been done and photographs taken of the experimental setups. The results have been tabulated and graphed with appropriate processing. The errors have been analysed, and additional research has been referenced. There is even an appendix where the AQA method of estimating errors is justified by comparing it to more thorough statistical error analysis approaches. Document contains ~19000 words and 95 pages (including title, introduction and contents page).
Thanks for a great resource. I wonder, do you have time to answer a query please? For the measurement of g using a pendulum, how did you calculate the percentage error in root length measurement (the 'delta l to power half' column of the table)? I would have thought that the percentage error of l (length) would be halved if you square root it?
PhysicsWithKeith
4 years ago
Good afternoon, and thank you for the kind review.<br />
<br />
I have just had another look at RP7, which you have mentioned. You are correct, I have made a mistake here. I will see if I am able to correct it and upload a correct version a little later. The error in the length is based on the uncertainty in the position of the centre of mass of the pendulum bob, which was estimated based on the length of the pendulum bob. I had, however, forgotten to halve the percentage uncertainty before calculating the absolute uncertainty in the square root of the length. This will change the worst-acceptable line of best fit and, consequently, the error on the value of the gravitational field strength measured by the simple pendulum experiment. Given that the mean value was 10.5 ms^{-2} and the error was huge (despite the line of best fit being really close to my data points; it was just the error bars that were huge, but would be half as long with the correction made), I don't think the correction will significantly change my conclusions.<br />
<br />
Nevertheless, thank you very much for spotting it! This resource is a few years old now, and no-one has spotted that mistake before.
PhysicsWithKeith
4 years ago
Sorry for my (rather lengthy) reply before. I have now made the correction. If (when) you spot more mistakes, please do let me know and I'll fix them!<br />
<br />
Thank you again!
Empty reply does not make any sense for the end user
A lot of work has gone into this and it is well worth the money. This has added to the live exemplars that I have. Thank you
PhysicsWithKeith
5 years ago
That is such a kind review, thank you! This is also available as a paperback on Amazon, if you're interested (sorry, couldn't resist a bit of advertising)
Empty reply does not make any sense for the end user
