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SC2Player last won the day on July 14

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  1. It may be difficult to measure the instantaneous velocity of the potato, but the average velocity can be calculated from distance traveled and time taken. The usual formulae for dynamic and kinetic friction in the mechanics section can't really be used for rolling friction, but if you know a method for measuring rolling friction between the wheel and the surface of the table, it's doable.
  2. Interesting that you chose Bio and Physics - the usual combinations are Bio+Chem, or Chem+Physics. Biology and Physics aren't particularly interlinked, unlike the other combinations (Bio and Chem apparently supplement each other pretty well, whereas Physics supplements Chemistry very well). It's still doable, just remember that they may be quite far removed from each other.
  3. IGCSE chemistry is definitely not a pre-requisite. I myself started out with much less chemistry knowledge (didn't even know stuff like what acids or bases were or anything about rates of reaction, let alone more advanced topics like organic chemistry), and I'm doing perfectly fine in HL right now. However, @MaferAA is still correct, in that it would be very helpful indeed. His suggestion of starting off with SL first before moving into HL is also pretty good, especially seeing that the HL material builds off the SL stuff. It may be more efficient to focus on the IB syllabus only, but I'd imagine the IGCSE syllabus would provide a more gentle introduction to high school chemistry, so either method would be OK.
  4. We can't give you an investigation topic per se, but it's not that easy to do an IA without experimental data, although it is possible. You could start with these ideas, from the syllabus: using a spreadsheet for analysis and modelling extracting data from a database and analysing it graphically producing a hybrid of spreadsheet/database work with a traditional hands-on investigation using a simulation, provided it is interactive and open-ended. There are quite a lot of simulations and databases online, so it should be possible to find something related to your interests. I also think your original idea is perfectly doable if you have time, as it's quite closely linked with the IB Chemistry syllabus (rate of reaction and energetics). You should be able to do a sizeable number of trials with a mini version of baths and bath bombs - just scale everything down significantly to save time. Remember, you aren't rewarded for the complexity of the topic, but on how well you plan, analyse and discuss it.
  5. For the breadsticks, it's $1.50 for 3 breadsticks, as it says "$1.50 for an order of 3 breadsticks", so you have 12/3 = 4 portions. Should be able to get the correct answer.
  6. It's supposed to be somewhat like a small psychology paper, with an abstract and everything, so usually it's written in third person. At least that's true for the higher-scoring IAs I've read, and what our school told us. And I don't know about IAs for other courses encouraging first person - I'm pretty sure that science IAs are usually written in the third person too. It just makes things look more professional. Keep in mind that journals are also outlining their personal research and ideas too, but are almost always written in the third person (although granted they don't need to fulfil some stupid 'personal engagement' criteria).
  7. Well, you're at high school, so you don't need, and are not expected to, have completely original ideas - that's for university and later. So if they're good at writing essays, follow the criteria carefully, and can integrate the ideas of others well into their papers (I think its OK to also cite the ideas of others in the essay, although I'm not sure about this), then they should still be able to get a 6 or 7 without reading the book. Of course, that in itself takes work, as they still need to read through all the analyses and make sure their essay writing skills are up to par. If they don't read the book, ignore the criteria, and just skim Cliffnotes the day before the exam, they'll probably still do pretty badly anyways. It's not like those websites are bad in themselves or anything, and its still good to read through other analyses of the texts, especially those that may offer different insights, but they are most effective when used alongside the text.
  8. The final IB mark out of 45 is based purely off the external exams at the end of the IBDP, usually worth 80% for each subject, your internal assessments (IAs), usually worth 20% for each subject, and the three bonus points, based off your EE and ToK (marks are allocated according to a matrix; search "ib ee tok matrix" and look for the most recent one for more specific information). Your in-school tests, such as your mechanics test, are probably going to be used for school marks alone, and won't make up the final IB mark. Wikipedia provides more information on the specific scoring system, as well as here. Search online too for more information. Good luck with your mechanics exam too!
  9. If you do past papers and the questionbank, and fully understand the syllabus, there really shouldn't be any major surprises. You do need to get used to "IB-style" questions, which can be done by doing what I've mentioned, but there's really only so much that can be changed while adhering to the syllabus. Keep in mind that it's supposed to be based off what's taught in class, as otherwise it would be silly to have class in the first place. Also, your mechanics test should be an in-school assessment that won't be counted towards the final IB mark.
  10. Pretty much agree with what @draknye said; I'm pretty sure people have done the same topic at my school sometimes in multiple years. As long as you don't end up having chunks of paragraphs word-for-word from her IA, you should be OK. Remember that you don't need complete originality, but just show your own personal input and thoughts to get the 'personal engagement' bit up, which should also distinguish your IA from your friend's.
  11. I'd recommend the Oxford study guide for an alternative textbook - short and concise, but still very relevant and useful. Great if you need a fast refresh or just want a quick review. I can't really recommend any videos, as I personally don't really like watching them. Also, you don't really need to 'save up' your past papers, and can still do some practice problems from older papers to familiarise yourself with IB style questions. You can still leave the more recent ones as mocks though.
  12. @slickblack_A Just like to add that the IA guide for the sciences only says that it needs to be "commensurate with the level of the course of study", and pretty much everything in the course is predictable and overdone, especially seeing that thousands of people do it each year, so there's always going to be some overlap. I did my own physics IA on Torricelli's law, a centuries-old theory that's been established countless times. However, I did still learn quite a lot of new things about fluid dynamics from conducting it, and it was fairly interesting. I do understand your concern about 'overdone' topics, and my teachers usually discouraged me from doing things that were too simple, but really that's something you probably only need to worry about at uni and academic research. What may help is to simply just change the variables you're manipulating in an experiment, e.g. instead of changing slit width or wavelength of light in the double slit experiment, maybe look at effect of polarized light on the pattern produced.
  13. Er, the link you linked to is wrong - it really should be 150 2/3, not 15 2/3. The person must've forgotten a zero somewhere. Really should be n=150 (n is an integer), which you seem to have got yourself.
  14. For the IA, it should be OK, as long as it makes sense and conforms to accepted theory. You're not expected to analyze sources for your IA - that's more for an EE.
  15. I don't take IB music myself, but from my experience, I can say that your selection of repertoire is fairly diverse in terms of time periods, although you do have two romantic composers - it may be wise to pick one Baroque composer instead for more contrast. Check with your music teacher for clarification - he/she is probably a much better source. Might also be worthwhile to see if there are any non-Western composers that you can play. Can't say much for difficulty, as I don't know what the IB wants. Hope this helps somewhat