Hiii, I finally got drive to work so now I can share images.

These are my physics homework questions, that I cannot do for the life of me (because content goes too fast, and my teacher loves to single me out because im the slowest learner in the class and because she is completely racist). I attempted drawing on the worksheet (question 1) it has diagrams and isn't one of the Pearson's questions. I can't answer any though, because I am so bad at physics right now. And my tutor didn't give me any notice before telling me that she couldn't tutor any more (though she has a new job, so good for her ig). But yeah, I am quite literally freaking out and there are so many questions, not too mention whole entire chapters to read. So yeah, life's been a bit hectic.

If any of you could help by even answering just one question, you would be a lifesaver. Thanks, šŸ™‚

    Bibliii
    Thanks @jinx_58 for your reply!

    Hey Biblii,
    Here is the link to the solutions for the rest of your questions in the last four images (I've combined the 8.1&8.2 Review questions and I combined the physics WS p1&2): https://imgur.com/a/JSg6pso.

    Sorry for my messy handwriting and image drawings - I was doing this in a hurry šŸ˜…. Nevertheless, hope this helps and as always, feel free to ask more questions.

    • PP

    EDIT: now that I quickly check over my workings, I notice there are a few spelling and grammar issues. Just try and ignore them - sorry!

        PhytoPlankton and jinx_58

        Hii, first of all, thank you for responding to this faster than my teacher has ever (I panicked and sent her an email saying I was sorry if I hadn't completed the homework). I just wanted to clarify a few things with the questions.

        For question 3 on 8.1 review, the answer you wrote was the "north pole of the magnet will point as geographic north which is the magnetic south pole". Does that mean that the magnet is facing magnetic south pole (the north part at least)? Sorry, I'm just a bit confused. Also with the calculations for all the answers that involved actual maths, it's just subbing in information into the formula and then just using ratios sometimes?

        For 8.2 review wouldn't question 5 and 6's answers be switched because A is closer to LHS which is west (for question 5), or is my brain just disintegrating.

        For the worksheet, (d) Aluminium metal is not affected by a magnet. Can an aluminium wire create a magnetic field? The answer would be no, wouldn't it. Because magnets only work in magnetic fields, right?

        Thank you both so much for answering those questions, you all will now be given the "saved my butt award".

        P.S. PhytoPlankton your handwriting is literally so neat, so umm not sure what you're talking about haha. Nevertheless thank youuu to both of you guys!!

              Bibliii
              For question 3 on the 8.1 Review, thereā€™s this concept that the geographic North Pole - where Santa supposedly lives - is scientifically a South Pole. This is because the geographic North Pole attracts other magnetic North Poles.

              I hope this diagram helps: https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcSqTPohiHrQQezAvOsUd-BBOOAuaK1PDzBIOw&usqp=CAU

              Idk if that makes sense but feel free to ask more questions.

              Also with the ā€œmagnets only work in magnet fieldsā€ thing, that not how it works. A magnet creates its own magnetic field. Every single one. So, because the Earth is a giant bar magnet, it creates it own magnetic field.

              However, if aluminium wire has a current flowing through it, a magnetic field is present. Any wire with an electric current creates a magnetic field. Check out the syllabus and the syllabus glossary, it really helps to see what QCAA actually want lol.

              -jinx_58

                Bibliii
                Hey Bibliii,

                All good - we're all happy to help!

                For the 8.2 review questions 5 and 6, it is a bit tricky and I just realised I didn't really explain it that well. So the main thing you need to do is draw the magnetic field lines on both magnets. As soon as you do this, you will notice that since both are north poles, the lines of each one will come towards each other (--> <--). So if we take a look at point A, would the LHS or RHS magnetic field line be stronger? It would definitely be the LHS magnet because it is closer and the RHS magnet would have a much weaker magnetic field line. So, now you need to take both of those magnetic field lines as vectors and find the vector sum so like this: ------> + <--- = --->. And that final arrow is pointing towards East. Does that make sense?

                Hope that clears it up and as always, let us know if you have any other questions.

                • PP

                    Hiii everyone,

                    I was just wondering if I coul get some help with these physics questions? Also I do have an answer for question 5, which is that it has to be sin and not cos because sin has a minimum value of 0, whereas cos does not (dunno if that's right or makes sense but yeah).

                    https://drive.google.com/file/d/11yPRllFWncm8MNNbQhlfoXY6ZdrbrbBy/view?usp=sharing

                    https://drive.google.com/file/d/18FUdb-NU0mGWl0SIxxCB2e_kS4jEGgB4/view?usp=sharing

                    https://drive.google.com/file/d/1ABEEPwn5TjH3Z5udojgMWyEFrjzqAyQg/view?usp=sharing

                    Thanks!!

                      9 days later

                      PhytoPlankton

                      No problems!! That would still be great thanks, I can do the questions with calculations now, I just need some help with the first few which are more theory based!

                        Bonjour or bonsoir,

                        I've just started my physics student experiment and was wondering if anyone could perhaps help me! PhytoPlankton (I think) helped me find this, so thank you to them!

                          jinx_58

                          Umm maybe how to write a good rationale, ofc I know the basics, like put all the theory and stuff, but I'm really not good at explaining that theory. I'd really like to do well as this is my last year, and I hope to get into med so any help or checking of work would be appreciated!

                              Bibliii
                              Hey Bibliii,

                              Here are my answers to the theory questions in your first image. I skipped number 1 as I believe Lorentz force is a topic that is not in the syllabus and thus, you do not need to know (correct me if I'm wrong). However, if you like, I can take a look at the questions anyways.

                              1. If you take a look at either the centripetal force equation (F=mv2/r) or the centripetal acceleration (a=v2/r) equation, you will notice that if you double the velocity (i.e. 2v) then due to the square, it will become 4v2. This means that the radius will increase by 4 times the original if you double the velocity.
                              2. Sin(theta) is used as this gives the perpendicular component (y-axis) whereas cos(theta) would give the parallel component (x-axis). The component that is needed to represent the force relative to the magnetic field is the perpendicular component which is why sin(theta) is used.
                              3. a) If the particle is positively charged, the direction of the force would be down. So, in this case, it would take path C.
                                b) C (answered above as well)
                                c) The kinetic energy should remain constant as the circular trajectory has a displacement of 0 and thus, there is no work done. No work done means no change in kinetic energy (according to the work-energy theorem).
                                d) Negatively-charged particles would go up (path A)
                                e) A neutral particle would travel in a straight line (path B) as magnetic fields only affect charged particles.

                              Hope this helps and answers your questions and let me know if you have any other issues!

                              • PP

                                lucy_ jinx_58

                                Oh if you need more info the practical is rolling a mass down different angles of an inclined plane and then finding the value for g. Measuring t and angle (I'm pre sure)Ā”

                                      lucy_
                                      Hey lucy_,

                                      @jinx_58, I don't want to steal your thunder here šŸ˜† but just wanted to let you know, I did the exact experiment in Grade 11 so I would be happy to help and add to anything @jinx_58 has to offer.

                                      • PP

                                          PhytoPlankton

                                          Bonsoir bonsoir,

                                          That would be amazing, I'll take any and all help!! My rationale is due Tuesday so ima take up as much help as possible!

                                              lucy_
                                              One main thing to talk about in the rationale is the independent and dependent variables, and how they affect each other. Then you use the equation, and explain the equation itself. For example, does g decrease or increase as the angle increases? What sort of relationship is it e.g. inverse proportional, directly proportional, exponentially increasing etc. How is this shown through the equation. Remember to talk about modifications and how exactly they improve the original experiment. @PhytoPlankton I am more than happy if you shoot tips and everything, I donā€™t see it as stealing my thunder haha

                                              I also highly suggest thoroughly understanding the marking criteria

                                              Hope this helps,
                                              -jinx_58

                                                  jinx_58

                                                  Oh okay! So i do it in that order? And do I just say the following modifications were made, as this will link to my modifications section of the report? Oh and how do you justify the modifications. Do you just say it will increase reliability, and compare this to the oe?

                                                      lucy_
                                                      Hey lucy_,

                                                      @jinx_58 is absolutely right. If I were to recommend an order, this is what I would do:

                                                      • Briefly explain the original experiment (this can be done at the very start or at the very end of the rationale)
                                                      • State the independent and dependent variable which should lead onto the below:
                                                      • You need to discuss the theoretical vs experimental equations. So this is where you discuss how you are going to calculate g from your experimental data and then you need to discuss the equation you are going to use to find the theoretical values for g.
                                                      • The derivation of the equations (especially for the experimental) needs to be shown, if necessary.
                                                      • This will then lead to you stating your relationship (like @jinx_58 stated)
                                                      • And that's basically it.
                                                      • This should lead to your research question which you may/may not connect to your rationale.

                                                      The only issue I find is that when you say you are looking for a value for g, you have to measure two variables and identify a relationship. So it seems you won't be discussing about the relationship/trend as much but rather how you extract/calculate g from that. Is that true or are you expected to discuss the relationship in depth like normal (which would make sense)?

                                                      Hope that helps and good luck!

                                                      • PP