Physics
For Physics Discussions
1,008 topics in this forum
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For our physics lab we decided to measure the the energy converted by a solar panel with different kinds of light bulbs. My question is should we have had the same amount of lux for each lamp? Because what we did was we had the same amount of distance, and of course, it ended with different amounts of lux. Lastly, my main question is, how could we possible link this to environmentalism? Thanks~
Last reply by Janus Antonio Agbing, -
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Hooke's law, F = -kx, suggests that the relationship between the force applied upon an object and its extension is linear. However, when I conducted an experiment, the results that I acquired were more indicative of a logarithmic relationship. With 0.05 N of force applied, the extension was 1.2 cm. By increasing the force, the increments of each increase in extension slowly decreased. This was true of three different trials. Is this supposed to happen (why?), or could there be systematic / accuracy errors resulting in these measurements
Last reply by KuncYare, -
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For the lab reports , i have been using Logger Pro to Produce the graphs , i tried to follow the criteria , and in the criteria it's mentioned that Error bars must be in the graphs well this is the most difficult thing to do any hints to produce a graph having all the required things that well fit the criteria hope to keep this as thread for all physics students who need help on their graphs , which is graded based on Aspect 3 presenting processed data " plz check the link " the problem is that i don't now how to add the error bars for it , i used logger pro 3.5.0 http://imageshack.us...dgraphbyme.png/ cheers
Last reply by KuncYare, -
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Hello, I've been in IB for just three months, and I know what is coming up for me this year as Junior, Hell maybe? Well, my question is.. Is there any good Website I can use for helping me with Physics HL? I gonna fail if I don't have any help at all.. Thanks.
Last reply by KuncYare, -
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I have to do a design lab for my physics IB course and I can do it on ANY topic from Physics 20 IB or 30 IB. I could use any suggestions possible. And if anyone has any examples of previous ones that would be great so I could see what a good design lab looks like. Please reply as soon as possible. Its coming due soon !! P.S. If its a Physics 30 IB lab idea, I might need some extra help cause Im just finishing up Physics 20 IB.
Last reply by KuncYare, -
Is there a page with ALL the formulas needed?
by Guest Another IB Victim- 3 replies
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Hi, I was just wondering whether there was somewhere I can find/download a list of all the formulas needed (outside the data booklet) for the IB physics (SL) course. Thanks
Last reply by Drake Glau, -
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Well is there anyone to tell me how graphs are getting done in excel 2007? Is there any guide for making graphs for the experiments? Because my Physics teacher told me that it is magnificent to do graphs electronically with uncertainties, error bars and etc... I NEED HELP :surrender:
Last reply by Procrastination, -
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Hola, People So, I'm doing a lab report on the domino effect and i'm sort of stuck, hoping that one of you guys can help out here. My problems is what are the variables for the graph? I have spacing and time. I can spacing (distance) as the dependent variable (y-axis) and time as the independent variable (x-axis), resulting in the gradient being velocity, but that doesn't seem completely right. Or I can graph velocity and spacing, and just get a constant as a gradient. Which seems more right? Cheers for the help.
Last reply by rFumachi, -
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Hello Everyone In the syllabus, there is one saying: I.2.5 Explain standard X‑ray imaging techniques used in medicine. I looked through several textbooks but the explanation seems vague. Can somebody explain this part? Thank you in advance
Last reply by Grassroot, -
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Hi guys! I find the new Physics book by Tsokos to be pretty easy if you just read the explanations, but the last questions of each chapters are much harder than the explanations. The problem is that in our Physics class we don't really study through the book, even though the things we do is related to the IB course. Instead our teacher gives us problems from the overhead to solve and in the middle of the lesson he has a lecture. But I really want to do the questions, which means that I have to work on my own.... So the main problem is, if you don't understand how to solve a problem, where can you get the step by step instructions which will get you to the answ…
Last reply by dessskris, -
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Take a look at the file that I have attached. Is it possible to figure out the ratio for all 3? How can you find Force of friction? and Egained (energy gained)?
Last reply by aDVnatgae, -
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a) car runs into a wall and stops... where does the momentum go (cant be destroyed or created)??? b) you are on skates. someone throws a heavy ball? how does your speed compare to the base??? why? c) I am on frictionless ice will my bagback. How I can move (slide) before i freeze??? thanks
Last reply by Drake Glau, -
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Please help! I'm completely lost on this topic. I felt like I was understanding everything in class but when my teacher gave us these questions, I had a panic attack because I don't even know where to start. I'm not asking for answers, but ideas on where to even start with these questions or what resources would help to answer them. SCAN0001.pdf
Last reply by Procrastination, -
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Hello everyone! I was thinking about getting an online tutor for physics, to improve. Does any of you guys tried online tutor? Also if you know any fine online tutor for physics, it would be really great!
Last reply by ThemisIsNoMore, -
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Hey people, Can anybody help me by determining a factor that has certain incidence in the falling time of a parachute taking into account air resistance? My teacher gave me some restrictions so I cant vary the area of the parachute, the mass that is tied up to it or the suspension lines, any ideas? Help will be appreciated, if the independent variable can be original, it would be better. Thank you beforehand
Last reply by Procrastination, -
- 5 replies
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I did a Physics lab in which I measured the height of the first bounce of a ball. I used a motion sensor to calculate it, so the uncertainty was really small: the smallest value it could measure was 0.0001, so the uncertainty would be 0.0001/2 = ±0.00005 (<--that's 5 decimal places). However, the values I got are, for example, 0.6798 (<--- that's 4 decimal places). In order to get a good mark in the 'data collection & processing' criteria, the values cannot have less or more d.p than the uncertainties. So how do I manage those uncertainties? For example, I can't write down '0.6798 ± 0.00005' because the decimal places don't match. I thought maybe about using sc…
Last reply by Sabs44, -
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Hello everybody! I'm a beginner to physics and I need a bit of help with Vectors. How would you answer this question? I'm unsure what I am really looking for.. A yacht originally moving north at 8kmh-1 experiences a current of velocity 1kmh-1 to the north-east. What would be the new velocity of the yacht as the current takes effect? Thanks
Last reply by Sabs44, -
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I recently got an ia to do which instructed me to carry out an investigation with water and balloon. i don't have any ideas on what to do so please help me out.
Last reply by Anmol929, -
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plz delete this
Last reply by Gaby, -
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I did a lab in my physics class, and I'm a little stuck. I used a 12 V power supply to test the specific heat an unknown metal, and recorded the change in temperature, time, and simultaneously had a joulemeter hooked up, converting the difference in energy to joules. so, i have joules, time, and change in temperature. how would i graph this data so that the slope/gradient is the specific heat??
Last reply by dessskris, -
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Ok so in my school, our physics teacher hasn't exactly covered the syllabus. In the span of two years, we are still on unit two and we have so many other things to learn. By experience, what is the test like? Would you recommend studying immensely? Tips? Any advice is appreciated!! Thanks!
Last reply by Procrastination, -
Ok so we know that a series circuit has one switch to control the whole circuit. What does it mean when the instructions say to draw a parallel circuit with 3 lamps and with one switch to control the whole circuit. WHat does it mean? Also, if a voltmeter is connected parallel to a lamp, does it mean that it a parallel circuit?
Last reply by Drake Glau, -
Physics Syllabus needed!
by Guest KAPOWW!!- 6 replies
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Hey guys can you send me a link to physics SL syllabus !! its really urgent, thanks a lot.
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Does anyone have good notes of this part of the syllabus? It would be great if you could upload them. Thanks
Last reply by sampas, -
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Im taking the Physics HL test in a week and am having problems studying. Over the last month i have gotten through the first 5 chapters, not a great rate to be studying at. Does anyone have any advice/ resources to help me study? Thanks
Last reply by Austin Glau, -
Just out of curiosity, what happens to the EM fields when it passes through a single/double slit?
Last reply by Drake Glau, -
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So I did an experiment about paper helicopters. The IV was the amount of paperclips attached and thus mass, and the DV was time it takes for the helicopter to reach the ground from a specified height. I'm unsure where I'm supposed to go with the analysis. I would strongly appreciate it if someone could just give me general nudges in the area of good places to analyze. But I will probably end up having to ask a lot of questions. >_<
Last reply by Hexa, -
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Are we supposed to maintain significant figures when presenting raw data or is that only in calculations? Because readings for different measurement thingies (time vs. distance) have different degrees of uncertainty...
Last reply by dessskris, -
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My Physics teacher wants us to do a practice IA now. I can't think of something easy to do. We were just covering Newton's Laws, and I was wondering if anyone on this site could give me some ideas on what to do regarding those topics. Thanks in Advance! Any help is greatly appreciated! If you think of something, I can think of how to research it, so I will need is an easy thing to do. Thank you!
Last reply by Margaret Sanchez, -
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My junior year, I decided I wanted to take IB Chem SL, but there was a scheduling conflict: they only offered it the period I have IB Visual Arts HL and my art teacher was absolutely NOT willing to work with me on this. So I've ended up having to take IB Physics SL to fulfill diploma requirements. I've never taken any prior physics class. Some background knowledge: I've only taken math up to Algebra 2, then I took IB Math Studies my junior year. I've taken Chemistry honors and have gotten an A in that class. Classes started a few days ago, and when I told my IB Physics teacher my situation, his mouth literally dropped. He was really incredulous and that kind of made me n…
Last reply by Chase01, -
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Hi this is my first posting, however I have just been given my IA topic; Simple Harmonic Motion, I am currently considering using a tank of water and creating a simple harmonic wavefront and measuring the correlation between SHM and energy in a wave, any advice would be great.
Last reply by ninale, -
Part A1 of Paper 2
by Guest KAPOWW!!- 3 replies
- 760 views
Hey guys, I'm not struggling as such but I am having a bit of a hard time getting the graph interpretation and reasoning right(you know, IS this proportion direct.) and more importantly forming equations that relate the two. So If you have any notes at all or any website that you know that could help me with this specifically, I'd appreciate it a lot if you could post those !
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Why does all the excess BE go to the radiated particle?
by Guest KAPOWW!!- 1 reply
- 656 views
Well all textbooks probably state something like this 'A Nucleus loses energy by radiation' I'm cool with that statement except the fact that all the excess BE or energy is lost only to the eg.alpha particle! and no mention of some being given to the new nucleus! Look at this for example: Mass Radium=226.0254u Mass Radon=222.0176u Mass Helium(Alpha)=4.002602u Change in mass=0.005198u Energy equivalent=4.84MeV Note: Energy of alpha=5MeV Resemblance of 4.84MeV to 5MeV-Uncanny So this is going to say that the lost BE is all given to the alpha, WHY? (or am I supposed to consider 5-4.84 for the energy given to the new nucleus)
Last reply by dessskris, -
Course Companion Doubt
by Guest KAPOWW!!- 1 reply
- 646 views
Heyo guys, haven't been to this section in a while. Here's what the textbook says" The best fit line should either be smooth curve or a straight line drawn with a ruler. Never join the dots, the trend lines are an attempt to highlight the possible relationships(w.t.t.e.)" SO I'm just looking to clarify that they joined the dots, so its easy to explain it to us right? Secondly- IF you don't draw a curve by joing the dots, how the hell else do you haha!? xP (i'm probably interpreting this wrong, since I just solved a past paper correctly by drawing the best-fit curve through the point. So if this is grammatical error or ambiguous please tell me you think so, SO I can in…
Last reply by Peanut Butter Jelly, -
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If my uncertainties on the x-axis how do I create my maximum and minimum lines of best fit needed for slope uncertainty?
Last reply by Hexa, -
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Heyyy... I have taken Physics and Math at SL. Currently, we r doing SHM in physics. I barely understand that chapter (one reason: it has a lot of math stuff that we haven't covered as yet). I would be grateful if anyone could help me with any tips, advise, suggestions, notes, good ebooks (besides gian coli and tsokos), questions, etc... I have a test day after tomorrow... PLzzzz helpppp ASAP... Thanks! Gosh! Physics is killing me!
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Okay, i need help. So, for my conclusion, do i need to analyse my graph?
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hey guys, I'm finishing off my IA for physics which involved a metal slinky spring. the dependent variable was the time period, but I just need to know the mass of the slinky for my controlled variables. I would've measured it in the lab but I have no time, my IA is due tomorrow. has anybody done a prac using a slinky before and measured its mass? it's the standard slinky and looks like this: http://www.profbunsen.com.au/shop/item/slinky-spring---wave-modeler thanks!
Last reply by xxshame, -
Urgent SHM Help
by Guest KAPOWW!!- 3 replies
- 985 views
Heya guys! I'm preparing for Physics SHM, so can I make a request for you'll to help me here, by sending me and sums that I can practice before the exam(no past papers-I've been told not to do them, since the last time I did the exact same paper that appeared in the exam lol) You could PM them to me, and I'm really grateful for any help! Now I have a question about this chapter: IS there really anything to understand or learn or just a freaking payload of formulas to mug? If no, what's the best way to mug?
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Hi, I'm in my second year of IB (just started) and I'm worried that my class isn't on track for physics. I'm an HL student, and we've done 6/8 of the core topics but no AHL and no options yet. So I have some questions: 1) What does AHL mean? Is this just for HL students? Do we have to do all of those topics, and why are they not in my Pearson Bacc. textbook? 2)If both HL and SL students do the same core topics, does that mean that core questions that we get in the exams will be exactly the same? aka can I revise by doing SL papers instead of HL papers (I can't get my hands on HL papers)? 3) Paper 1 is multiple choice, what are papers 2 and 3? Where does AHL come up? Thank…
Last reply by dessskris, -
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I have to do several labs, but I have no idea when and how to use maximum and minimum gradients and how to apply them... Please some help?
Last reply by Rigel, -
Question on Atomic Spectra
by Guest HeartLocker- 1 reply
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Hey guys I was wondering if you could help me by discussing two different ways in which atomic spectra can be used to deduce physical data for stars.
Last reply by Procrastination, -
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Hello everyone and thank you for reading this post. I would like someone to check my current physics laboratory and put some comments on what I did wrong and how can I correct it... please... Also, I do not know if what ive been doing in the lab is correct and what can I conclude?
Last reply by akr1, -
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Does anyone know whether if Physics HL has fluid mechanics as a part of the course? If so, what section? I really want to do it as my EE. Thank you!
Last reply by dessskris, -
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Hi all, I am in HL Physics and we have been given a design lab called The Ice is Melting. Basically, we were given an abstract saying that the ice caps in Arctic melted really fast. The the main point was that the people living there observed that the bottom 50% of the ice melted faster than the top 50% of the ice. So what i had done was to crush the ice, and place different masses of crushed ice into a funnel, where this water dropped. Per min i will time the change in volume in the cylinder. Using that, i will calculate what is 1 cm^3 of ice= x ml of water. And see the mid-point of the total water collected in the measuring cylinder considering that the volume should c…
Last reply by Elegant Poodle, -
Physics potential divider doubt
by Guest kenshi64- 7 replies
- 3.3k views
Hey guys can you please explain to me ( a Physics SL student) how one gets the potential divider formula in terms of R2 and R1. Please show me a step-by-step derivation of the formulas,(I really appreciate it!) Thanks SO much! Note: In the wiki formula replace VL with V out and Vs with VIn]
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hey guys, I needed some help, I've drawn error bars on my graphs for my physics ia but I wasn't sure how to add the trendlines of maximum and minimum gradient? Thanks in advanced xx
Last reply by saunders is god, -
Most effective way to study for physics
by Guest Mo Rahman- 2 replies
- 1.3k views
Hiiii Okay, so I'm about to start my second year of the IB and I've realised that I need a better, more effective, way to study physics (after scratching a 4 in my exam). Here's my current status: in lesson I understand most of what's going on and can comprehend the concepts fairly well. However, when it comes to answering exam questions, I am absolutely terrible. (Just quickly, here I'm going to assume that formula's are everything in a physics paper because that's how I see it. Feel free to show me otherwise.) In lesson, the practice questions are specific to what we're learning and the formula that needs to be used is usually the one we've just learnt in the lesson…
Last reply by The Filipino Limner, -
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I'm currently revising for my physics exam, and I am finding it SO difficult to remember and understand all the right hand grip, finger and palm rules. Could anybody care to help and explain them to me? And when I am meant to use them? There's 3 or 4 I think. But I'm really quite confused about which is which and in which situations to use them. Thank you >_<
Last reply by Drake Glau, -
Radioactive Decay
by Guest KAPOWW!!- 11 replies
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Can someone explain this excerpt from my textbook please? "IF nucleus A was made from its constituents (Binding energy) and it released 400MeV, but making nucleus B(product) releases 405MeV. Therefore if A changes to B, 5 MeV of energy must be released. This excess energy is given to the particle emitted" Thanks guys!!
