Great video and perfectly timed. I’m unsure what type of error parallax is: while systemic errors include observational errors, random errors include procedural errors. I could see both as fitting.
Another question: if a question includes both the absolute uncertainty and gives you the opportunity to calculate range/resolution halved, should the absolute uncertainty be prioritised?
You're right, you would think that parallax would be systematic as you're looking at it from constantly the same angle but remember, you're likely at the same angle but the object you're observing will be in a different position. Which makes parallax less systematic and more variable. So they're classed as random.
'Absolute' for repeat data should be half the range for repeat data. So they're unlikely to provide both. Absolute just means the uncertainty in the quantity with the unit (as opposed to the %). Though they might provide it because they're expecting you to do something else with the repeat data, like eliminate anomalies and calculate the mean. And they don't want to give marks on top of that for finding the uncertainty.
Man I really hate this paper.... got around 2 weeks before exams start and marking and going through a paper 3 has really been making my confidence go down. For the worded questions, whenever I give an answer that I think sounds logical it always never is which is making me questions myself if I even know anything at all.
Everybody feels that way! Especially for the 3 or 4 markers. Sometimes they are very obtuse. I would say, focus on getting as many as you can with those and try not to worry about the couple of lost marks. As long as you are keeping your calculations tight and you’ve got the practical skills, you can sacrifice those.
@@nutshellphy Thank you for the advice and support I really appreciate it. Do you have any upcoming videos releasing anytime soon? I have suggestion, which was if you could go through the Edexcel paper 3. I imagine that would take a long time and as exams are around the corner you would be pretty busy.
You know, I had the exact same thought! So I’m going to try to do that this weekend. I’ll use the 2022 paper. Maybe not go through it all but pick out helpful bits.
it would've been great if we could have a video like this for Paper 6. Anyhow, will this video be any helpful for my paper 6 exam tomorrow ? Like the general tips outlined in the video. Will this video be worth a watch?
Thank you so much sir this was super helpful. We’ve been given the advanced info should we focus on all the core praticals or all the praticals in the topic given to us
The only Core Prac on the advance info is no 6. Which leads me to believe they will be asking about subtraction to find a distance and the uncertainties you get as a result. Know how to read an oscilloscope trace, especially the time base setting.
After that, it’s just about applying your experience. Remember… reducing the effect of errors! What can you do with what you are given in the question to do that.
@@nutshellphy I saw that radioactive decay was mentioned again which I thought was shocking considering the fact there was quite a few questions on radioactive decay on paper 2 I assumed they might ask a few questions on the core practical or ask us about beta , gamma and alpha radiation
When finding the uncertainty for repeated measurements, would you divide half the range by the smallest division of the equipment? I wasn't too sure what I'm dividing by. Also, do you have any tips for the 6 mark "essay" questions or any ideas for specific topics, Thanks :)
No, it’s just half the range. To get the %u from that you divide by the average of the repeats. The equipment resolution is only for times when you don’t have repeats.
Topics… I don’t know, could be anything although perhaps stationary waves. That one didn’t come on P2. Advice… do not write an essay. Your examiners are looking for specific points, just expressed well. And that means without waffling and in a logical order. So jot down the points you want to make first and then compose the answer. Keep it as short and to the point as you can.
Hi sir, thank u for the video! I was just wondering what the difference is between the percentage uncertainty and the uncertainty of the equipment, can you interchangeably put them in your answer? as sometimes the mark schemes use uncertainty and sometimes they use percentage uncertainty, and I was wondering how you know which one to write! Thanks in advance.
The uncertainty is the value in the unit of the instrument. So a metre rule has a resolution of 1mm and a single measurement made with it has an uncertainty of +/- 0.5 mm. The % uncertainty then tells you how that compares to the measurement you actually made. So if you only measured something of 10 mm with a metre rule (a bad idea!), the 0.5 mm represents 5% of that. If you measure something of 300 mm, the 0.5 is only 0.17% of that. So the percentage gives you an idea of the effect of the uncertainty on your confidence in your measurement. I'm editing another video about practical work right now that should be up later tonight... watch this space! And good luck with the exam.
Like ‘g’ or Planck’s constant. We know the value of those. Everything else, like the length of a piece of wire, has a true value but nobody knows what it is, we can only measure as best we can.
We've got this lads
Idk man 😭
Exam tomorrow! Good luck everyone!
Thank you so very much! Amazing explanation! Loud and clear!
Thank you! I've been really struggling with paper 3 and this was very helpful :).
This was great help for tomorrow! Thank you very much sir.
Most welcome. Hope it goes well!
Great video, amazing tips and information helped a lot !!
Glad it was helpful!
Great video and perfectly timed.
I’m unsure what type of error parallax is: while systemic errors include observational errors, random errors include procedural errors. I could see both as fitting.
Another question: if a question includes both the absolute uncertainty and gives you the opportunity to calculate range/resolution halved, should the absolute uncertainty be prioritised?
You're right, you would think that parallax would be systematic as you're looking at it from constantly the same angle but remember, you're likely at the same angle but the object you're observing will be in a different position. Which makes parallax less systematic and more variable. So they're classed as random.
'Absolute' for repeat data should be half the range for repeat data. So they're unlikely to provide both. Absolute just means the uncertainty in the quantity with the unit (as opposed to the %). Though they might provide it because they're expecting you to do something else with the repeat data, like eliminate anomalies and calculate the mean. And they don't want to give marks on top of that for finding the uncertainty.
thank you so much
Thank you. What paper is the question in 13:30 in?
Man I really hate this paper.... got around 2 weeks before exams start and marking and going through a paper 3 has really been making my confidence go down. For the worded questions, whenever I give an answer that I think sounds logical it always never is which is making me questions myself if I even know anything at all.
Everybody feels that way! Especially for the 3 or 4 markers. Sometimes they are very obtuse. I would say, focus on getting as many as you can with those and try not to worry about the couple of lost marks. As long as you are keeping your calculations tight and you’ve got the practical skills, you can sacrifice those.
@@nutshellphy Thank you for the advice and support I really appreciate it. Do you have any upcoming videos releasing anytime soon? I have suggestion, which was if you could go through the Edexcel paper 3. I imagine that would take a long time and as exams are around the corner you would be pretty busy.
You know, I had the exact same thought! So I’m going to try to do that this weekend. I’ll use the 2022 paper. Maybe not go through it all but pick out helpful bits.
This was so helpful
for edexcel will we be given 1 astronomical unit in the question or do we need to know the value of the constant
You should not need to know the value, no. It will be given to you.
it would've been great if we could have a video like this for Paper 6. Anyhow, will this video be any helpful for my paper 6 exam tomorrow ? Like the general tips outlined in the video. Will this video be worth a watch?
I did say that in the video. Apart from specific advice about the graph question, it’s still practical work! So very relevant.
you saved my life homie
Thank you so much sir this was super helpful. We’ve been given the advanced info should we focus on all the core praticals or all the praticals in the topic given to us
The only Core Prac on the advance info is no 6. Which leads me to believe they will be asking about subtraction to find a distance and the uncertainties you get as a result.
Know how to read an oscilloscope trace, especially the time base setting.
After that, it’s just about applying your experience. Remember… reducing the effect of errors! What can you do with what you are given in the question to do that.
@@nutshellphy I saw that radioactive decay was mentioned again which I thought was shocking considering the fact there was quite a few questions on radioactive decay on paper 2 I assumed they might ask a few questions on the core practical or ask us about beta , gamma and alpha radiation
@@nutshellphy notes will definitely make sure to have this done
@@nutshellphy yeah after reading the appendix and looking at the apparatus and uncertainties I’ve quickly seen my marks go up
When finding the uncertainty for repeated measurements, would you divide half the range by the smallest division of the equipment? I wasn't too sure what I'm dividing by. Also, do you have any tips for the 6 mark "essay" questions or any ideas for specific topics, Thanks :)
No, it’s just half the range. To get the %u from that you divide by the average of the repeats. The equipment resolution is only for times when you don’t have repeats.
Topics… I don’t know, could be anything although perhaps stationary waves. That one didn’t come on P2. Advice… do not write an essay. Your examiners are looking for specific points, just expressed well. And that means without waffling and in a logical order. So jot down the points you want to make first and then compose the answer. Keep it as short and to the point as you can.
@@nutshellphy nice advice
Good help just to make sure I understand everything, thanks for the video!
Do you need to do uncertainty differently if there is zero error on the equipment?
No, just add or subtract the zero error from every measurement and then proceed with the uncertainty as normal.
I have the exam tomorrow what would you suggest doing between now and then? I feel like I don’t know much.
dw lil bro im cooked too
@@TehRedBoy might pull a U in physics fr
Hi sir, thank u for the video! I was just wondering what the difference is between the percentage uncertainty and the uncertainty of the equipment, can you interchangeably put them in your answer? as sometimes the mark schemes use uncertainty and sometimes they use percentage uncertainty, and I was wondering how you know which one to write! Thanks in advance.
The uncertainty is the value in the unit of the instrument. So a metre rule has a resolution of 1mm and a single measurement made with it has an uncertainty of +/- 0.5 mm. The % uncertainty then tells you how that compares to the measurement you actually made. So if you only measured something of 10 mm with a metre rule (a bad idea!), the 0.5 mm represents 5% of that. If you measure something of 300 mm, the 0.5 is only 0.17% of that. So the percentage gives you an idea of the effect of the uncertainty on your confidence in your measurement.
I'm editing another video about practical work right now that should be up later tonight... watch this space! And good luck with the exam.
@@nutshellphy ahh thank u!! I will put notifications on for your channel! I need all the help I can get with paper 3 🤣
thanks for this
i cant find the glossary anywhere on the specification, do you have a link you can share with me?
qualifications.pearson.com/content/dam/pdf/A%20Level/Physics/2015/Specification%20and%20sample%20assessments/PearsonEdexcel-Alevel-Physics-Spec.pdf#page119
Page 106.. 😊
@@nutshellphyit says page not found
what do you mean by fundamental constant in the definition of a true value
Like ‘g’ or Planck’s constant. We know the value of those. Everything else, like the length of a piece of wire, has a true value but nobody knows what it is, we can only measure as best we can.
Actually g is a poor example. G is a better one!
lovellyyy